Where Do These Books Belong?

New York City police raided a home for several very good reasons that didn't include suspicion of book theft. But in the course of the raid they turned up a collection of Civil War books valued at $20,000 (probably a conservative estimate). The lady of the house has operated under 25 aliases and has a lengthy rap sheet so authorities suspect she may not have collected the books via legitimate methods, but they have no indication of who the true owner might be.