Easiest fix is to restore the backup you probably made when you decided to go the OS way.
However the books you had deleted should easily be found by sorting on the date added column. If you had deleted books from a date range, select all books in that date range and either try to view them or run the bulk convert to see if these are the ones you want to delete. (you should get errors if they are missing or have them come up in the viewer or conversion log
if they are not.)
Then remove them. If you do it all at one go or in batches of 25-100 still should not take long.
Helen
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