I've had a few people try and reverse payment that went through PayPal, one after 17+ months. They usually say the card was stolen or unauthorized use. I've won each dispute by just providing the info PayPal requested. Last I looked the seller is protected by PayPal if the transaction is under $750, you can provide shipping info (fedex tracking) and you ship to the verified address listed in PayPal. I've never had an issue beyond the inconvenience.