I just went there yesterday and and found this out.
I bought an Xbox 360 Elite, went straight to Gamestop to trade in the games that came with it - Forza 3 and Halo.
I open the Elite in the car take the game out and walk in. Immediately they say: "If it's brand new, we can't take it."
I say, "OK, well I will just rip the plastic off and then trade it in."
Them: "Nope. Once we have seen it brand new, we can't take it. You can open it and then take it to another location, though."
I asked them why and they said that they are now considered a "pawn shop" and have to carry a pawn license and that requires them to NOT buy unopened products due to theft from retail stores!
So I say "Well, what if I bring the 360 Elite in from the car WITH the receipt showing I just bought it?"
"Oh yeah, well then we can buy it and open it ourselves to sell."
So I traded it for $24 credit and they ripped it open for sale, even though on the case it says: NOT FOR RESALE. lol
NEVER habe I heard of them getting new releases in and opening them though...This must be new...