I just had a look in my images directory. There are 768 images. So, that's about 256 books. The library list says 102 books. That suggest 252 covers from somewhere else. They probably are for recommendations, as I have bought a few books and do a sync a couple of times a week.
The database has a row for each book. This includes the imageId. You could delete all images that don't have an imageId in the database. That needs a little SQL and a script. And I think I would be lazy. Move all the images out of the directory. And then generate a script to move the images that have an imageId in the database back.
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