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To state the obvious, it looks like it has never synced.
Make sure you have the Whispersync for Books setting toggled on (Settings->Device Options->Advanced Options->Whispersync for Books should say ENABLED).
Is there some reason you are side loading, instead of just downloading? Especially since you want to export your annotations: for that you need to connect to WiFi anyway. You lose Enhanced typesetting features, plus it just seems inconvenient.
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