Connect your tablet to calibre using the cable. Let it scan etc until it is done. You will now have a "Device" icon on your tool bar. Click that icon to switch to the "Books on the device" view then search for inlibrary:false. You will get a list of books that calibre was unable to match to books in your calibre library.
For completeness, the search inlibrary:true will list all the books that calibre was able to match with books in your library.
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