Hi Penny  thanks for the reply. Yes I did send it to the address in  PayPal. I went back and found the email that eBay sent when the item sold and that address matched the address in PayPal and the order details. 

He did say that some of his mail had been going to the wrong address so I'm wondering if that's why! I asked him to check his order details in his purchase history as that should show him the same as what I'm seeing. 

Unfortunately, the item was a one off so can't send a replacement. It sold at auction for $23 so not a huge amount. There was no suggestion of a dispute in his message  but just wasn't sure where I stood if he did decide to open one given there was no tracking. I guess I have the messages between us. Notsure if they count for anything. 

If it was genuinely lost I'd have no hesitation in refunding, but if he's given me the wrong address, I'm not sure I should?