if you are looking for something specific i.e. GC BB adaptor or a certain game or games, i would try and find the product number on the site and call CS, or just call the customer service desk and have them check the comps.
if i had to guess, im sure there is a ton of crud in back, but i saw the closet in one true and it was full of games, so full of games that i wished i lived in that closet, but mostly the same titles and games that were mass produced and sold terrible. like drake, bloodrayne, some other stuff, but there has to be something in a closet like that. the kids that worked there were cool- i should have asked them if i could take a look.
something else i noticed that was strange: they had games in a case with white paper covering the top and it said DNI (guessing for do not inventory), but they werent green on the edges, so they either are PS2, GC, of the copies of bambi or indredibles they keep trying to shove down my throat, but if they dont i get a soda. yay.