I wrote a dual biography of Charles and Anne Lindbergh entitled Loss of Eden, published by HarperCollins in the early 1990’s. After publication, I used to get phone calls from people who claimed to be the Lindbergh baby. One of them was a black woman who claimed that her race and sex had been changed as part of a conspiracy to disguise her identity. She had discovered the truth by doing five hours (!) of research at the New York Public Library. (My own research rarely goes this quickly.)
Never heard of this claimant, but there are still a few of these nuts around.
Have you tried asking the liberrian for help?