In the image folder....
e893x3 is labeled as e893x
Weirdly, renaming it to e893x3 resulted in getting a "image e893x not found" instead, so things might be a little more convoluted i guess.
Looking panel by panel i found out 3 images -
e890,
e891 and
e892 - between e869 and e893x that the game seems to completely ignore, no scenes for them.
And then in the span between e893x and e899, where i expected to find the possible "
e893x3" lost image, i found out instead TWO -
e898x1 and
e898x3....

So i'm at the same time happy and confused like fuck right now.
Everything else seems to be spot-on - plus i wouldn't even have imagined the bits we were missing or where to look for without your suggestions, so my real thanks.