Indeed there are many deer getting around in WA now, however to go into details on a web forum about species and locations is considered in many circles to be "poor form" by those who like to hunt deer in Western Australia.
Our "culture" in this respect, is much different to other nations, and even some other states of Australia where deer are "native animals" and classified as "game" to be hunted under various regulated seasons, licenses, and bag limits, etc.
The reason for the difference here is that various local state legislation & regulations, declare any deer outside of a licensed deer farm, to be "declared vermin" (to be shot on sight), under agriculture protection board regulations.
Indeed employees of the Agriculture Dept who work as Agriculture Protection Board 'officers', will actively seek to destroy, shoot, trap and poison, any such "declared vermin" (what the rest of the world would recognize as a game animal to be revered) lest they spread like rabbits and make agriculture (growing of crops and horticulture etc) non viable.
Some other states of Australia, and much of the rest of the world, recognize this as folly of the worst kind, but not here - its the facts we live and deal with day to day.
As a result - to post the details of the deer herds that exist outside of deer farms (i.e. in the wild), in response to your request would just allow someone with different values and mind set to the rest of us, to copy & paste it into an email, to be sent to the Agriculture Protection Board Officers - thus ensuring yet another potentially hunt-able deer herd gets trapped poisoned or shot to oblivion before it gets a chance to establish.
So with the exception of licensed deer farms - deer aren't protected in any way here in the West Of Oz.
Most posts will always give you clues, like the reference to the black buck (alive and doing well by the way) but refer to them as having died out from poisoning or being shot out years ago etc etc...
That's always "the official line" in anything published on the matter.
In short - if to all intents and purposes they don't exist, then no govt agency is required to do anything to get rid of them!
If there were non here - then, why would WA now have its own branch of the Eastern States based ADA (Australian Deer Association) with more than 50 paid up members?
The thing is everything to do with Wild Deer In WA - is a "secret squirrel society" whisper here or there in the right rear with a wink and a nod and a secret handshake and password.
It's taken a full generation of hard work and expense by a dedicated but small band to get these herds established. There whereabouts are closely kept secrets among a band of like minded brothers.
One of the biggest problems this band face - is our culling culture when it comes to hunting. We have evolved from the rabbit plague of the great depression era with a mentality to spotlight everything at night from the back of a farm ute (pickup truck) and to shoot them all until they are gone / eradicated.
We don't have any deer hunting tradition that values the animals as game.
Many of the small numbers deliberately released to establish viable herds, are sadly shot to bits before even one breeding season, usually the stag / buck, and the rest of the does / hinds run down by piggers with their dogs, before they even get the opportunity to bred once.
Very few shooters here IN West Oz can bring themselves to stay quiet and allow a herd to establish - often the mentality born of our rabbit culling history is to "shoot it quick before someone else does.
Without an established deer as game culture and stewardship of the resource mentality, by all shooting groups - the establishment of viable self sustaining hunt-able herds in Western Australia - combined with Govt Ag Dept determination to exterminate them, has always made establishment a very difficult process - not that some haven't been trying since white settlement as far back as 1898 with the royal acclimatization society's efforts!.
One of the limitations - is as alluded to already the existence of 2 families of naturally occurring plants that are completely toxic to non native stock including deer (and goats etc). There are the plants that are members of the gastrolobium family, and include heart leaf Poison down south and the York Road (box) poison closer to Perth around the hills areas that your question relates specifically too.
These two plants families produce a natural form of the poison 1080 (its poisons registration number when synthesized for feral animal control programs) and its active constituent sodium monofluoroacetate, for which there is no antidote.
Deer (and other European/northern hemisphere based ruminants) that graze these species tend to die quick and painful death.
There are only 2 natural grassland plains in Western Australia - suited to the introduction of deer, where these plants families do not occur.
1. The Mitchell Plateau in the Kimberly region
2. The Scott River Coastal Plane, (East of Augusta)
Anywhere else the deer can and do survive including Perth hills BUT they tend not to thrive and spread - they live on improved pastures of local farms and as a result come into contact with farmers and the old historic culling mentality - or they eat poison plants in our forests and succumb.
Lastly there's the problem with legal access to hunt these deer, where they do exist.
I recall at least 40 years ago, that there were vast areas of VCL (Vacant Crown Land) in the Western Australian Govt land estate whereupon it was legal to carry firearms! Some of my generation might recall - the days of hunting ducks on lakes on crown land for example with a duck license.
You could even get a gun license thru police with just a duck license from Foresrt dept - becaiuse it showed you had somewhere to legally us it.
Not the case now days.
There was a deliberate move among the WA State Govt land agency's (for whom I worked as both a forester and Wildlife officer at the time), to vest all VCL (Vacant Crown Land) after the High Court running in Australia in favor of indigenous peoples land rights (The Eddie Mabo case).
All VCL now is pretty much "vested for some land use purpose" now - because VCL is subject to legal land rights claims.
The downside of this, is that it is NOT legal to carry a firearm any longer on most of this now vested land. (i.e National Parks, State Forests, Flora Reserves, Fauna reserves etc and so on).
These are the very areas where the deer tha5t do exist sleep and water etc during the day before they go out into neighboring land owners improved pastures paddocks at night to feed!.
So the difficulty is - that its largely impossible to get a permit to carry a firearm in State forest (I used to issue the permits).
So there's the next problem for you to overcome - how do you get legal access to the land on which the deer live?
In short - its neigh on impossible.
So as a result - much of the secret squirrel society hunting of wild deer in Oz (if it doesn't occur with land owner permission on farms) occurs in state forests without landowner permission.
There are permits available but its a matter of dept policy not to issue them (to anyone but their own staff - again i held the corporate firearms license and issued the permits in a former life).
In truth the Forests people would prefer to see the deer gone, remembering they aren't protected they are declared vermin to be shot on site by Govt rules / laws, its just that its not legal to carry a firearm into the forest where they reside to shoot them.
As the local wildlife officer - I didn't waste my time looking for deer hunters with firearms in state forests - I had better things to do with my time, and to be truthful would deliberately look the other way if I knew someone was getting themselves a deer for the wall or freezer. However times have moved on and newer younger more zealous wildlife officers abound these days looking to get any conviction they can in order to justify their existence. So I cannot in all conscience suggest that you go break the law to bag a deer.
What MANY do, is be extremely discrete about your activities in the forest! Look like any other bush walker, no cammo gear, a checkered flannel shirt in dull greens and browns is just as effective, but doesn't signal "illegal gun carrier in state forest" No need to have Paul Hogans "That's a Knife" machete strapped to your leg, - no bandoleers of 500 x 30 ought 6 rounds strapped across the chest like a Mexican bandit.
Most guys just dress like the local farm boy, but choose your colors and pattern to work the same as camo gear. Many do their pre hunt reconnoitering unarmed.... work out where your watering and bedding and feeding areas are going to be for the upcoming rut. Its not illegal to drive you 4wd around the bush or walk around checking out places.
On the day of the hunt - many will just get dropped of at 3.30 am with rifle and simple day pack - and walk in - do the business with one clean shot kill - ad arrange a pickup via mobile phone after dark in a lonely deserted spot.
Those with high and mighty ideals like to call this behavior "poaching" as tho all the deer belong to the king like back in Robin Hoods days.
The facts are, that if you don't get caught, because no one sees or hears you, and you don't come to the attention of the local forester / wildlife officer by your behavior - you can have a long and and successful deer hunting career in WA, - but they key thing is be discrete!
If you want to strap the buck to the bonnet, and wear your cammo gear & 4 ft long knife, into the local shop while you fuel up, you better guess that the local shop keep is going to be on the blower to the local wildlife forester guy with all your details while your still fueling up.
Keep your firearms out of sight, look like a local farmer of fisher or something, take the deer home to hang it inside your shed to skin it out, and don't let everyone see what your doing.
It's a secret squirrel society here for a reason.
The laws are very unhelpfull in our case, and many of those charged with the responsibility for enforcing them, recognize that and tend to be happy to look the other way, just as long as we aren't getting written and verbal complaints from every man and his dog, about a bunch of red necks shooting the place up!.
Its ALL about discretion here in the West Of Oz...as far as deer hunting goes.
If anyone asks - there are non.!
And you definitely don't post pics of the ones that died out, or where they are currently located OK?
Other considerations are that there are a group of individuals in Oz that are investing many $ into large hunt behind wire setups for exotic species.
These people have a fiscal axe to grind. They don't want the average Joe knowing he can get a certain species free ranging - when they are trying to sell that hunting behind wire experience. They also don't want the Ag protection board peeps poisoning or shooting herds that could be trapped to put into hunt behind wire operations.
So they tend NOT to like the idea that people will share this "secret squirrel club white mans business" via the internet and forums such as this.
That pretty much sums it up for West Oz.
According to my research there are:-
Indian Blackbuck Antelope.
Running wild in Western Australia and more than one herd of each.
Were all the details made public they would be lucky to persist even 1 year IMHO for all of the reasons listed above.
In the case of these little fellows, well one complicating issue for access is that - they are on land now owned jointly by the Oz fed Govt and US govt for a secret listening (spy) base in the mid west of Oz.
It's protected by Soldiers with rifles... no exactly the sort of place you want to get caught wandering around 'poaching' in camo gear with rifle!
These were introduced back in 1898 by the States Royal Acclimatization Society (fore runner of today's Perth Zoo), and released to a Mr McKenzie - Grant at Moonyanooka (East of Geraldton). During ww2 when US servicemen were stationed at Geraldton, & they were culled from the back of WW2 Willies jeeps with bren guns for pet meat.
This is where the oft quoted rumor of them all dieing out, arose from, but in latter years the Farm sold to the Clune Family (Bernie Clune last i recall) BUT as said since then some of its been sold to Fed Govt and US joint spy listening base.. so good luck getting legal access to hunt them there today.
That's probably the reason they are doing so well nowadays.
And that's how it is with most of the deer herds here in West Oz today - you have to do your home work, speak with the right people, maybe consider joining the local West Oz branch of the ADA, and do some work trying to locate the herds and garner legal permission to access the land if you can.
If you can't, then learn to be discrete!
Remember they are declared vermin to be shot on sight under APB regs - so worst you'll get is charged with carrying a firearm in state forest, but that can have ramifications - like losing your firearms license if Police then judge you not a fit and proper person to hold a firearms license.
Lots to consider hey!