Many ebooks don't include the original pbook cover, because the publisher does not have a license to use it for an ebook. So they often have a generic cover, or no cover at all. It seems that publishers do have a license to use the cover for on-line sales, which is why you see it at Books on Board.
If you strip the DRM (encryption), I think Calibre can download the cover (e.g. from Amazon) and add the cover for you although I have never tried adding a cover.
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