Twenty odd years of evaluating and buying and part exchanging used photographic equipment from the public for the company I worked for was enough to make me very sceptical because to hear the sellers speak nothing was ever faulty, everything was always mint, and to buy cameras and lenses 20-40 years old or more sight unseen from an auction site from the other side of the World brings to mind the old saying about " buying a pig in a poke". I admit I do buy stuff off eBay but only small accessories like lens hoods, focusing screens etc. and odds and ends that are unobtainable elsewhere.