Anonymous book donor revealed

Found in a collection of ephemera this intriguing typed letter from the long vanished New York bookshop Tessaro's. The shop was in Maiden Lane which appears to have been a kind of bookseller's row. The address later housed a rare bookshop called Sabin's. Tessaro's was formerly called Rohde and Haskins who had dabbled in publishing at the dawn of the 20th century.

The letter deals with a request for the identity of the anonymous donor of a book from the recipient - a nurse (presumably) at The General Hospital at Fox Hills.  The shop decided ('we'll take a chance') to reveal the donor's identity. Significantly he was a soldier, as Fox Hills was a very large Army hospital dealing at that time with WW1 casualties. There the story ends. It would be nice to add 'and reader she married him.' The bookshop as go-between must be uncommon and in our cautious times it might not reveal the donor, or possibly send on the request to the donor for permission…

Dear Madam 
Acknowledging receipt of your note of 28th July we would say we do not know that the sender of the book desired it to be known who sent it, but we'll take a chance and say to you, in confidence, that it was mailed to you on the order of Lieut. G.C. Anderson.
Yours very truly,
TESSARO'S

Fox Hill Nursing Staff (1921) from
Advance Archive Photos (many thanks)