Tim Baxter sent this link to the official announcement of the new
U.S. Fish and Wildlife Service regulations concerning elephant
ivory trade:

https://www.doi.gov/pressreleases/administration-takes-bold-step-african-elephant-conservation-completes-near-total 

  Administration Takes Bold Step for African Elephant Conservation:
  Completes Near-Total Elephant Ivory Ban to Cut Off Opportunities
    for Traffickers
  Office of the Secretary
  Special rule for African elephants under the Endangered Species Act
    contains limited exemptions for bona fide antiques and items with
    small amounts of ivory that are not drivers of poaching
  6/2/2016
  Last edited 6/2/2016

The FAQ (Frequently Asked Questions) explains that "small amounts of
ivory" in a piano means less than 200 grams, which they say is "large
enough to accommodate the white key veneers on an 88-key piano."  See

https://www.fws.gov/international/pdf/questions-and-answers-african-elephant-4d-final-rule.pdf 

The Piano Technicians' Guild (PTG) is the focal point for piano-specific
interpretation of the new ivory trade regulations so the topic will not
be discussed in MMDigest.  Ask your piano tuner-tech about local laws
(e.g., New York State transport permits) and watch at  http://www.ptg.org/ 

Robbie Rhodes
Mechanical Music Digest