Imported dip and pack skins MUST de delivered to a federally registered USDA import station, that is a Taxidermy studio or Tannery that has a current liscense on file with the USDA. Has nothing to do with USFW. I have seen one hunter clear skins themselves and years later get a knock on the door from USDA. The hunter collected their skins themselves and cleared them. Took them and had them mounted , ONLY to have the USDA take the thophies off their walls, yes with a warrant and remove them from the clients home and they were never seen again, They were destroyed.
If you have a salted Buffalo, monkey, babboon or wartnog, your asking for trouble, maybe someone lets it go thru, but it's you in the end that will be in trouble. Sorry to be the bad guy here. These skins MUST be delivered by a bonded agent to these faclities, you cannot drive them there yourself.
Clearing mounted trophies , completly different scenario.