If a book was topaz and had the drm stripped, the spelling errors would be in the mobi file in calibre as well as the converted epub. Because the spelling errors in a topaz book are in the underlying OCR code you don't see when reading the original drm azw file. The only thing you see when viewing the topaz azw is image glyphs. The OCR code is used to feed the dictionary and search portion of the kindle.
It would help if he linked to the exact book (on Amazon) he purchased and is having trouble with.
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