Have you asked him what he's trying to use them for. If it's potf2 I would be inclined to decline as your auction clearly states they are vintage 1983. If it is something like a micro collection I would say refund him as the ad doesn't specify they are for the 3 3/4 inch xwing. Stupid, I know, but so are eBay users.
If you accept the refund it draws a line under it though, so if you don't want the hassle, get them back, but watch out for empty boxes. You didn't send a 12 back chewy with these did you?