The auction noted the condition of the book as "very good with a split to the front endpaper which occurred at the annual Houdini Seance." Included was a letter explaining the chain of ownership and photos of the book being examined Anna Thurlow, the great granddaughter of Margery (who graciously gave us an interview here).
Among the other Houdini items sold in the auction were an original portrait shot of Houdini and Bess ($598), a signed photo of Houdini in hat ($1,609), and a signed portrait of Houdini smiling ($1,647).
A magic wand said to have belonged to Hardeen received 11 bids and reached $971, but did not meet the auction's reserve.
Thanks to Joseph Holland and Norman Bigelow for the tips.