From the League of American Orchestras: “The recent Obama Administration effort to increase restrictions on travel and trade in African Elephant ivory has placed a new focus on long-existing, but largely unimplemented permitting rules for international travel with instruments that contain endangered species material.”
The League has published a helpful webpage with very detailed information about this issue. Click here for that page. The League will be updating that page as more information becomes available.
In addition, here is a link to a related article that was recently published by NPR.