[Clarity]

has any history with them. You should be able to open a case against him.

We have an eBay store, so it could be different, but our buyers have to pay shipping both ways to return the item.

The only thing he could do is give you a bad feedback and then you can explain what happened (short but sweet) in your feedback of him.

He does sound crazy. His claim would be against UPS anyway, not you, because you can prove you did not send it out damaged.