The kindleunpack APNX code unpacks the page information to an Adobe pagemap.xml file. The reason for that was that NCX pagelists were generally not well supported in epub2. In epub3 the nav pagelist not the ncx pagelist is used. Kindle support for converting ncx pagelists is not even part of KindleUnpack.
If you have questions, I would be happy to point you at the appropriate places in the KindleUnpack code.
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