It may have sold for too much....
....even if it was a rough casting. Weren't a bunch of those part of an exhibition display that Mel Jung had at the convention about 10 years ago? The exhibition display included actual dies, and if I remember right, Mel sold the whole package to Dean Porter after the convention. Also, I seem to recall Mel having the rough castings available for sale individually. There could well be a number of these or similar items still out there.