So I own a seal skin sporran...

[Drac]

If it helps I ran into a similar experience with a piece of walrus tusk. Was told it was preban but the tusk didn't come with the metal tag required on registered pieces.

I contacted a dealer who specializes in ivory (if I can draw a parallel) and asked him about the tusk and how I registered it. He said that the ones and twos aren't the issue with the goverment. Not that it was or wasn't illegal but unless you have a garage full of the stuff they were not likely to come down on someone or unless you go waving it in their faces such as taking it across a national border.

Jim