I pulled your email signature because of spambots. See this.
If you have your member settings set to receive email, the members can email you just by clicking on your username at the top of any of your posts. A flyout menu appears and you just select to email the member. You can put it back in if you really want more spam, but I done my duty handing out the caution.
Those are actually called en bloc clips. The whole clip goes into the magazine along with the ammo. Stripper clips are those straight ones that sit in a guide above the magazine and that you strip the ammo out of as you push it down into a magazine.
I know of a fellow at the CMP forums who might take an interest in your clips. I'll send him a link to this thread. He can join the forum and email or PM you if he is.
You have 30 clips for $50? Couldn't quite tell from your post.
By the way, is the headstamp on the ammo LC 72? If so, you'll probably be able to make out faint machinegun link marks on the brass. The LC 72 should not be shot in a Garand. This stuff was all loaded with a slow lot of WC852 which was qualified for machinegun only because the burn rate was too slow for Garand gas ports. The old DCM, not realizing this, had surplus links of the stuff broken down and the ammo put into the en bloc clips and put back in the cans and distributed it for Garands. Apparently a number of bent op-rods resulted. I don't know if the clips originated with Lake City or not. Anyway, its fine for a bolt gun or a machinegun, just not for the Garand.