Like, is it the files you see when you open the Photos.app, or does it include all images (e.g., jpgs)?
Asking because my Photos shows 7GB and my photos.app is literally empty
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On my machine it only counts the photos in any photos library on the drive or one opened from an external drive (which looks weird, when it shows 800GB of photos/videos on the system drive with 250GB capacity, while it's actually on the external one).
This being said you should be able to find the pictures somewhere:
Library/Application Support/Apple/Photos, not 100% sure though and can't verify right now)