LR Duplicates importing from LRC

Last winter I imported my entire LRC catalog into LR one year at a time using LRC export as a catalog.  Everthing seemed to go fine but I recently discovered some years have duplicate photos most with the same file number and file type.  I've been manually deleting the dups in my free time and so far I've deleted well over a thousand.  

So, is there a way to find the dupicates in LR without having to manually scan each folder?

All of the importing was done using my MAC M1.