I was working in a LGS about 1970 when a BATF agent stopped in. After browsing the store, he dropped a stack of paper over 1/2 inch think on my counter and asked if I'd seen any of them.
The stack was a single spaced, both sides of the paper list of all the firearms then known to be missing from government stocks. Being pre-computer, there was no sorting of type, make, model etc. Just a list, probably in the order they were reported missing. An interesting list, but useless for checking anything presented for sale.
Paging through it while bored, most seemed to be rifles & pistols. I do faintly recall a couple of BARs among the missing.
The article mentioned a theft discovered when empty pistol boxes were found on base. Rank stupidity. Leaving the boxes in the vault, maybe with a metal bar to approximate weight would have delayed discovery for quite awhile. Possibly decades. A thorough inventory of racked weapons where they can be individually verified should limit theft. Key word being thorough. Stuff that may be boxed might only be verified during an IG audit.