IMO (having worked at a public library) the vast majority of inventory is donated second-hand books.
It may be impractical to verify that all my copies are gone, but is there any reason it wouldn’t hold up under first sale doctrine?
Any 17 U.S.C. § 109(d) experts in the house?
Physical books fall under a 'property purchase' model while ebooks fall under the 'license based' model. A good (albeit basic) read: https://goodereader.com/blog/e-book-news/this-is-the-big-rea...