This is the skinny on JC:
Jungle Cock are both on the CITES list of Endangered and Threatened Species, a US Fish and Wildlife permit is required to legally bring parts of either into the US, UNLESS, you have proof that the materials came from specimens that were killed PRIOR to the date of CITES.
If the animal was a 'recent' "legal" kill, under cites, the Exporting Country also has to grant a Permit from that country before it can legally be shipped, or exported, from that country; in addition to the US Import Permit and all "point-of-origin" permits.
ALL documentation must accompany the materials throughout the trip. The exceptions is: For jungle cock that has been domestically raised, all that is required is PROOF that the cape came from a domestic bird.
The associated "Red Tape" for such an Import is designed to be sufficient enough to deter the average fly tier from going to the trouble to bring such items into the US.