22WRF - I agree with 99% of what you said. Thank you.
The 1% where I am not so sure: If a person wrongfully transfers animal parts in violation of any state, tribal or even foreign law, and that transfer spans an interstate boundary then I believe they could be criminally charged under part 3372 of the Lacey Act.
A taxidermist in colorado defrauds his clients,skips town with their animal parts and then sells them in Nebraska would be in violation.
http://www.fws.gov/le/pdffiles/Lacey.pdf Hard to say whether the feds would actually prosecute. However I did see this article in the Denver Post today where a western Colorado outfitter was convicted and sentenced to jail under the Lacey Act for selling hunts to out of state hunters where the hunts illegally involved tree stands over bait.
http://www.denverpost.com/breakingnews/ci_22584561/colo-hunting-outfitter-fined-sentenced-prison 
