If you live in cities with large Chinatowns (e.g. NYC, SF) you might want to consider taking a casual stroll through them and checking out antique stores if you see anything that seems off and if you do report it to https://www.fws.gov/refuges/lawenforcement/report-wildlife-c...

Word on the street is that FWS is rolling out/testing new tech that will make enforcement a lot easier.