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FWIW - I had a kindle without being connected to calibre for weeks just up and delete all its sideloaded books one day (the amazon loaded ones were fine). The folder structures were left but the book files themselves were gone. I believe this is possibly the first time I've seen this in more than 10 years.
I had it blocked from the wifi in recent times but who knows if there was some old firmware waiting to autoinstall next reboot/crash etc
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