How to find tracks with multiple artwork?

[theo1498576218]

I would like to find a way to find iTunes tracks which have more than one image file embedded. It used to be clear at least visually when there was a square (?) below the image indicating other images to click through. I know that a smart playlist with the album artwork set to "= false" will find tracks without artwork, but is there a comparably simple way to search for artwork "= >1"? Thank you.