I just came across a good, short, and clear article, "Antique Dealers Come Face-to-Face With Ivory Ban" By Kristin Hugo in National Geographic online (July 8, 2016) that explains the difficulties for the antique trade the new ban on sale of endangered species material has caused.
The new ban restricts interstate sales of ivory items to two narrow categories: antique ivory that’s proven to be more than a century old and items that contain only a little ivory, such as a violin bow with an ivory tip.
increasing stigma against ivory ownership and tighter regulations at the state and federal levels have been encouraging dealers to gradually get out of the business.
it also points out that
It remains legal to sell antique ivory within states, other than in California, New York, New Jersey, or Hawaii, which have passed state bans on the ivory trade. Other states have legislation pending. That means a market still exists for some ivory sellers.
Lastly, the article offers some guidance on what to do with ivory items you are unable to sell:
Ivory owners who want to get rid of legally acquired ivory can donate it to the Fish and Wildlife Service’s national wildlife repository, in Colorado, if they’re willing to pay the shipping costs. Or they can simply keep it in their own private collections, which Lang said is a popular option for antique dealers wanting to remove ivory from their stores.
Owners may also offer to donate their ivory to a museum. Art, culture, and science museums in particular might be interested in legally acquired, historically significant ivory, according to Sheila Hoffman, the chair of the American Alliance of Museums’ ethics subcommittee.