Você realmente não deveria ter um problema. Do site CBP :
Bones, horns and hoofs that are imported as trophies may be imported without further restrictions if they are clean, dry and free of undried pieces of hide, flesh, or sinew.
Para outras preocupações, o CBP encaminha você para APHIS para obter mais informações, já que é um órgão regulador real responsável pela importação de subprodutos animais:
Many animals, game birds, products and byproducts from such animals and game birds are prohibited, or allowed only restricted, entry into the United States. Specific requirements vary according to the country of export. For more information about importations by country, please call the USDA, Animal and Plant Health Inspection Service(APHIS), the National Import-Export Center, tel. (301)851-3300, fax (301)734-8226. Since hours of service and availability of officers from the other agencies involved may vary from port to port, you are strongly urged to check with your anticipated port of arrival before importing a pet or other animal. This will assure expeditious processing and reduce the possibility of unnecessary delays.
No entanto, se você estiver preocupado com isso, ainda poderá enviá-lo para si mesmo e evitar trazê-lo para a fronteira por conta própria.
