I contacted the curator at the Lincoln Museum by email. His reponse:

This is entirely a hoax. Clever, too. We have an official stastement to that effect due within the hour. -James

James M. Cornelius, Ph.D. Curator, Lincoln Collection Abraham Lincoln Presidential Library & Museum 112 N. Sixth St. Springfield, IL 62701-1310 217.785.7954 http://www.alplm.org