Dont get caught with it. No matter what you hear on this site, I was "schooled" by one of the largest furbuyers in the US and a friend of the family works who for US fish and wildlife both with the same info.. It is illegal to have in the US, no matter where or when it came from. You will be held responsible, period.
Now, on the other hand, I'm sure there are not wardens at every tree in the woods looking for it, I'm just saying know what you are doing. Marine Mammal Protection Act. Research it fully.