Duplicate Movies in Collection

‘m looking for a functiion that lists all titles of my collection that are in the database more than once. Is there a function/addon that does that trick?

I aware of the function that cleans up the database but I really want to find dupe existing titles that are simply stored in different folders of my NAS.

At the moment I’ll do this by simply selection all movies, sort them alphabetically and go through the whole list and check if I see two identical covers next to each other.
This is quite time consuming so I’m looking for an option similar the missing movie add-on which finds movies that havem’t been scraped.