I recently bought MW3 for 360, from Walmart. I lost the receipt. One big problem, the day I opened the game. I put it in my xbox and it said "open tray" I fiddled around with it for a little, and got it to work. It worked for almost 2 weeks, now it doesn't work again... Would I be able to take it back to Walmart and get a new one? Without the receipt? I've had a couple people tell me they'll give me a new one, even though I don't have the receipt. Can someone please tell me if I can, and how...