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You can't simply copy the files into calibre's folder unless you get the file name *exactly right*, something that is rather hard to do.
The better solution is to select the book in calibre to which you want to re-add the format. At this point the book's details are showing in the details pane. Next drag the book format file onto the cover in the details pane. Calibre will add that format to the book record. It will think it is replacing the existing (missing) format, but that is OK.
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