I have received a return from an eBay user in Belfast - a cosmetic mirror backview but it is not mine never sold one never bought one, how do I get it back to the right person but obviously not at my cost?
Unless you can somehow identify the seller, there is nothing you can do. Keep an eye out for it happening again as it might be that an overseas seller has your address as the return address on their account. If so, then getting ebay to deal with that is not easy!