If there is no actual way to get a signature confirmation, maybe you can type up a little note, bring the card to the post office. Show the card to the worker, then pack the card, give it to the worker and ask him/her to sign your paper that states that you did indeed mail the correct card to the correct person and the worker actually saw the card go in the box.
This might not be totally legal. But it might give you a little bit of recourse should PayPal contact you.
Cy
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