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RISKY because you should never do any changes inside the Library folder using other than Calibre,
Did you also restore the metadata.opf in the same folder?
That contains the database Entry backup (needed for a restore).
BACKUP BEFORE trying. <<<<<<
On the Library Icon, Library Maintenance:restore database
That read those files. Otherwise you are going to build a New Library (in a new Location) using Add Books: From folders and sub-folders (not all metadata will be recovered if you had not previously embedded it into the Library Copy)
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