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KFX books on e-ink kindles will show up. On Fire's they dont. But even if they show up, it is useless, since you cannot actually transfer them to calibre or use them in any way (KFX is a device customized format, in spirit like a PDF generated for the individual device screen). Nowadays to get the actual book in MOBI or azw3 format you have to go to your manage my content page on amazon and download the book for transfer over USB, which will give you a proper ebook file.
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