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Are you using Calibre?
I've no idea why whatever software you were using has lost contact with your old books. A few more details might help.
What program are / were you using?
Are they DRM'd books, from SOny? or Other? or DRMfree books? or de-DRM'd books?
If they were DRM maybe you've managed to lose or corrupt your key. Maybe you need to re-register your device with ADE?
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