get pix and make a copy of EVERYTHING( auction, paypal recipt, shipping label, any emails, the whole 9 yards) before you send it. that way they can't pull a switch on you and say you never sent it back/they never got it or that you sent them your old one/broken one. that way if they do, you got got all kinds of evidence to show to paypal, BBB, lawyer or whatever that they they are comiting fraud. believe me its easy insurance, I've seen it done and it worked.