Not an unexpected problem this. As I mentioned on another thread I enjoy buying up neglected old photo slides at house clearance auctions. And some of the pics are interesting and actually of some cultural and historical importance. But they are Orphan Works - I own the slides but not the copyright, and the auctioneers don't know the copyright owner and often they have come through a circuitous route through dealers and intermediaries to the auction. They have almost certainly never been publish