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The convert dialog shows whatever cover is set for the book in the calibre library folder. Normally when you add a book, provided it has a properly identified cover, that cover image is extracted and set int he calibre library. Presumably your EPUBs dont have properly identified cover images, or you deleted the covers from calibre at some point, or you turned off reading of metadata in Preferences->adding books or you disabled the epub metadata reading plugin in preferences->plugins
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