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download a free book from amazon via the Kindle wi-fi, then browse the kindle drive folders & see exactly where it is located.
Then drag n drop the other books from your PC to same location. Calibre should do all that automatically though ???
unless you are trying to add DRMd books that are registered to a different Kindle, but then I'd expect a "cannot open book" error, not for them to go invisible on you.
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