Well im purchasing an xbox 360 (deja vu) from a dude, and I just wanted to ask is there any way to figure out if the serial number has been registered with xbox? I think once he would come here I'd check the seal, and test if it works blah blah, but do I call 1-800-my-xbox or something and then tell them the serial number? How can I figure out if its registered? He says it isn't but I want to make sure (scammers these days) any ideas or answers would be great. Thanks.