I no longer pay attention to Ebay feedback, which is all bull, as far as I am concerned. Who cares if you have 100% or 98%? As for a refund...

Did you say, no refunds? If so, you are off of the hook. If the buyer cannot produce proof, you are off the hook. But only with yourself - not Ebay. Those people will side with the buyer unless he has 666 tattooed on his, or her, forehead.

So, inform the buyer that no refund is forthcoming. Explain why and then wait for his reaction. Chances are he will drop the whole thing, if it is a scam. If he does pursue the issue, things will be, pretty much, out of your hands, unless you can prove to an uncaring Ebay agent that you are on the up and up. And that does not even work, sometimes.

That is, of course, an opinion, and based on dealing with the Ebay refund deity who is, apparently, without a brain or the freedom to use it if he, or she, does have a brain.

Personal rant but, these days, I do not give a good rodent's rear end about how Ebay feels.