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Depending which device he's using you should have an option in the library view to filter only the books that are on the device (i.e. whole book has been downloaded to it, not just the cover). I can't remember which of the older devices might not have this option, but if you're running a "newish" firmware it should be there. It's in the library settings accessed via the three lines at the top right in the library screen and tick the box to only show downloaded books.
Not sure what options there are for in Android.
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