Just to answer the original question, most used but not processed rifle brass runs about 2.5 to 3.5 cents each online. If you process (clean, remove military crimps if any, size, trim, chamfer and deburr) that'll raise them to 5.0 to 6.5 cents each, depending on the size. Do be aware that making money selling cartridge components to the public technically requires an FFL. I don't know how they handle the broker sales or one-time estate sales or one-time divestiture of personal property? If it's not a regular business for you it seems to me it should fall under the private sales exclusion and they may not care, but I would call the ATF and ask, just to be safe? You may want to put them on consignment through a local gun shop if you don't get a clear answer or don't have friends or relatives who will buy them?