No Restrictions On Mammoth Ivory
Or Mastodon Ivory.
The African Elephant Ivory Laws are as follows. (in brief)
Any old stock preexisting elephant ivory that is already IN the United States is still legal to Buy Sell & Trade WITHIN the United States.
Items made of African Elephant Ivory cannot be shipped to non U.S. destinations and no new worked or raw elephant ivory can be imported into the United States.
There are certain exceptions.
Specific finished ivory items that can be documented to be at least 100 years old can still enter the U.S. with that documentation...and legally taken trophy tusks with the C.I.T.E.S. and import permits can be brought into the U.S. but, (I Think) cannot be sold once they are here.
Since the U.S. is out of the world trade of African Ivory....using up the old domestic Ivory that is already here in no way affects African Elephant populations & does not promote poaching.
But, when it's all gone it's probably gone for good in the States.