As above to get your selected cover into each epub.
However, you may also like to know that if your main concern is that the T1's thumbnails match the cover you have in Calibre, then you can edit the Calibre device driver for the PRST1, found via Preferences - Plugins - Device Interface - PRST1 - Customize. Just make sure you check the box 'Upload separate cover thumbnails for books'.
This will create the T1 thumbnail as your Calibre cover for every book you send-to-device. It works for all formats (epub, pdf, txt) DRM or non-DRM.
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