I'm sorry to say this but if you are in a paypal dispute it is near impossible to get your money back. This is partly because payments are taken as a gift, so paypal offers no seller protection. Even if you took the payments normally it wouldn't matter because as far as paypal is concerned you can only prove a delivery with a tracking number. At the end, to add insult to injury, you will likely be billed an additional $20 to pay for whatever "fees" they deem relevant.