I love the scans with the "tell" - nicely done!
I have a Flickr page with the regular & green tint versions side-by-side for comparison. Everyone is welcome to view it, & some of my fellow OBC members have even printed it off & taken it to shows to help with the hunt:
https://www.flickr.com/photos/obctom...7602774575697/
For the harder ones, look closely at the cropping differences. They are sometimes very subtle, but they are there.
Tom