Slightly similar, years ago I sold a Pentax 67 camera via ebay to a guy in France. Two weeks after sending it I received a message telling me that the camera was smashed beyond recognition and he wanted his money back. I told him to return the camera to me and then, after I'd had a look at it, I would give him a full refund. A few days later I received positive feedback with no mention ever again.

I can only guess that he wanted the camera and the money.