75 identical copies in the book return

A library found 75 identical copies of one book in their book return. See picture. Think the author donated these? A bookstore? Any other theories? The multiple copies makes me think of a scene from the movie My Blue Heaven.

Quote from the movie My Blue Heaven:
[Vincent Antonelli is questioned about the stolen goods in the trunk of the car he stole]
Hannah Stubbs: The books…
Vincent ‘Vinnie’ Antonelli: You have something against books?
Hannah Stubbs: I have nothing against books! I am curious about the books in your trunk.
Vincent ‘Vinnie’ Antonelli: You see, I was thinking of writing my story, so I bought this one on how to do it.
Hannah Stubbs: Why do you need 25 copies of it?
Vincent ‘Vinnie’ Antonelli: In case I want to read it more than once…