Payment by paypal,keep your records

Last year I had a guy from Canada bought a pair of cables from me, he said that he is going to have his friend from the US pay me with his paypal account,( around this time paypal doesn't have service for Canadians yet). I'm thinking as long as the money is on my account who cares where I send out the cables.So his friend payed me and I got the payment confirmation from paypal and promptly send the cables to Canada. Here's the problem 7 months later Paypal emailed me saying that the payment that was made 7 months ago was being reversed and they are taking it out of my account,paypal told me that the credit card company filed a claim and that the account that was used to pay me was fraudulent. So I emailed paypal back explaining the situation and even giving them the email address and name of the person that I sold that cables to. Paypal emailed me back asking for proof that I shipped the merchandise, something that they can track it clearly stated.Obviously I don't have a tracking number as I shipped the cables via USPS and who will keep their shipping receipt from 7 months ago?So I emailed guy I sold the cables to and guess what? no responce.And since I did not keep my receipt for mailing the cables to Canada I end up paying paypal the money from my account.

I really learned my lesson the hardway so just a reminder to everybody. KEEP ALL YOUR RECORDS and always use a carrier that has some form of tracking.Hopefully this doesn't happen to anybody else.