This is all way more complex than it needs to be. Just drag the folders from your recycle bin to some other folder say c:\restored_books in your computer. Then in calibre right click the add books button and select add books from directories, one book per directory and point it to the c:\restored_books folder.
All your books will be re-added, with correct metadata, with the only caveat that the date column will show the current date rather than the original date. If you want to restore the date column then you have to use the restore database method previously described.
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