I have a golden rule about this sort of thing. After I have checked with the address provided by eBay (PayPal do not provide a postal address, only a contact email address), I then contact the buyer, and ask for confirmation of the FULL postal address ( Sometimes people provide just a name and postcode for the contact!). If there are any discrepancies, then I would take this up with the buyer and perhaps involve eBay, if things look suspect.I also request a telephone contact number at the end of the sale.
In this case, I would check your facts regarding the buyers address. If the fault was due to you, then you would be liable to cover your own loses. If the buyer gave false details, then negotiate on the basis, that the error was theirs.