In case anyone is interested, the NYPL library contact information is:
Robert J. Vanni
Vice President, General Counsel and Secretary
The New York Public Library, Astor, Lenox and Tilden Foundations
Fifth Avenue and 42nd Street
New York, New York 10018-2788
tel. (212) 930-0744
fax (212) 391-2503
rvanni@nypl.org
I'm not sure if this is still current. When I contacted Robert on an auction item a few years ago, he advised that it had been de-accessioned. He also welcomed queries on any other item where title might be in question.
Max