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You can appeal the claim. Although, it will only works for the seller. However, you should be able to appeal the claim by following these steps:
For seller's who are following this thread, the decision can be reversed if one of the following is met:
Well, if you know for a fact that the buyer really did use their own PayPal to pay you, then I would recommend contacting a legal expert. Also, this is the community forums for PayPal. Meaning, anything you ask on here is publicly available for anyone to answer and to use - much like eBay's community forums at Community.eBay.com. And, I do not know if PayPal employees can see your transactions.