The Bazaar does not offer returns, refunds, or exchanges for familiar titles that may already grace your shelves. Rest assured, the Curator is remarkably thorough in his review of the details you provide. However, his precision is only as sharp as your disclosures allow and he has yet to master the art of clairvoyance.
To avoid the scandal of a double acquisition, the Bazaar strongly encourages you to share your public Goodreads, StoryGraph, or other logs of note. Should that be too difficult, you may always complete the feedback surveys for each parcel. Within these, letting him know which new tomes have found their way into your personal collection.