We had one of those - the buyer bought it on the day I left for Nepal, but there was a discrepancy in her address (ebid had one, paypal had another). After a day or 2, she messaged using the AAL to tell Ray which address to send the package to. Ray did the envelope to the address she gave him. Just before xmas, we had a message from her saying - package not received. I clarified what address we sent it to, where she wanted it to go, shared mail box? etc - all the usual things I ask in these cases. We refunded her money.
It turned up Tuesday - with a royal mail sticky on the envelope - adressee gone away.
Just goes to show - even if they give you the right details it isn't always the case.