Either they bought it directly or some 3rd party dealer did and is trying to get more money for it...
It was quite a nice cap but I wouldn't have spent that much for it ($950) to start with, let alone EUR1,650!
This hobby is getting quite expensive; I wonder if I shouldn't switch to something more 'rational'/'logical' like gold coin collecting. At least there's norms and market standards regulating value there... :-k