Rumor is they found a box in the old Stanwell shop, but seeing as these are one of a kind, I think they are prototypes or ones put back for some reason or another. The HCA above is free of fills and the only sand pit I see is right on the rim of the bowl, very high quality stems as well. Most smooth pipes listed have exceptional grain, the blasted pipes are all different from normal production models as far as staining, etc.
Did you see the model 1020, it looks like an active volcano... I don't recall seeing a production made in Denmark pipe like that before.