Yup, just happened to me today, just bought guitar hero II for the xbox360, i bring it home, open up the TAPED BOX, and in there i find the guitar in the wrapper, but the instruction manual and stickers and guitar strap weren't in wrapping like they usually are, so i go back in the store and tell them "i want my money back, this is used", "uhm, no sir, its brand new" "no its not, its not wrapped" "yes sir it is". So i give them the benefit of the doubt, and bring it home.
Turns out the controller is broken and doesn't turn on. NOW i'm really angry, so i march back to the store at closing (6:00), i get there at 5:50 and the door is locked, i knock and tell the lady that she is a huge liar and i not only want a refund but i want it in cash. "well sir we can only give you 90% cash, story policy", "thats a lie too, i've gotten full cash before, can i talk to nick (the manager and my bud). "He's in the back" "get him" "ok". So nick comes, i explain it, he gives me cash back, calls the gamestop about 10 minutes away and tells them to stay open until 6:10 and let me in the store to buy a new guitar, for 50% off. So officially gamestop does re-wrap old games and sell them for full price.