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Fwiw, Kindles used to keep their page maps as separate files (.apnx) that is not part of the epub.
KindleUnpack has the ability to create an adobe pagemap.xml file from a separate apnx file associated with kindle files in .kf8 format.
I have no idea how the KFX file format stores page numbers. Perhaps jhowell knows. He created the kfx to epub output converter that calibre uses.
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