Use the bulk metadata downloader (book list > edit metadata > download metadata and covers). The review metadata window gives you a chance to merge in the existing IDs instead of overwriting the old ones.
Unfortunately, this is limited in one manner - you can't pick which search result it'll use. Occasionally I've gotten a completely different book. In that case, just copy the old ISBN, download metadata normally, then paste it back in.
Last edited by ownedbycats; 01-08-2022 at 08:29 PM.
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