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Calibre is using the number in its "ASIN" metadata, but definitely is not a valid one (has way more than 10 characters). I don't know about that calibre cover metadata but I guess is a random string associated with both the book and the thumbnail's name (that I tried to emulate without success).
I just noticed that indeed the cover is being extracted from the personal azw3 and saved as "thumbnail_<random_six_chars>.jpg" (really random chars. They re-roll if I cut off then restore the same book from the documents folder), and another one with four random chars if I insert the mobi counterpart of the book.
The problem is that the azw3's cover is not showing (the mobi one showed perfectly from the beginning, even with the personal tag), so maybe really the problem is the personal thing.
Isn't there a tool to modify the properties or whatever it is, of an azw3 to get rid of that Personal Document property?
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