You cannot use calibre to check if an azw3 file has page information, since calibre knows nothing about page information in azw3, it will just discard any such data present in the azw3. You would need to dump all records in the azw3 using
calibre-debug file.azw3
or the kindleunpack program then use a hex editor to examine any records that look like they contain page information and reverse engineer them. I'd start with the PAGE record.
However, since amazon appears to strip the PAGE record from books it delivers to devices, it seems likely that the actual Kindles wont use them. SO even if you figure out how to create them, you would then need to modify the apnx generator code in calibre to strip tham and convert them to apnx when sending the azw3 files to the kindle.
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