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It is possible to have book entries in Calibre without any associated ebook being attached to the entry. The fact that you mention the size column being blank suggest this could be the case.
If you select the option to edit the metadata what format(s) show up in the box at the top right? Is it possible for instance that the file extension is wrong so that Calibre does not identify them correctly? Note that if they are DRM protected eBooks then you will need to get the DRM removed before you can manipulaet the books with Calibre.
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