I'm looking to buy a 12" powerbook for from a private party and it is in box/factory sealed. Do I have anything to worry about if i buy it from him without a receipt? I get AppleCare and all that even without the receipt, right? What do you guys think, is it scetchy? The guy seems legit, i'm just a little paranoid that's all! Any advice anyone on the transaction and all?! thanks!