Substantive?
‘edge erase’?
Really?
But the PRESENTED part is 8 1/2. That means the image cut out is LARGER than 8 1/2” if it came from a real document.
Why edge erase or clip mask anything? This is now reverse engineering the explanation to fit the problem.
Lets see some other documents with the shadow left-bend printed on security paper. If no examples in 24 hours - then I call BS.
The PRESENTED part includes the edge erase. The visible green basket-weave background is only 8.17”x10.5”. The white is the clipping mask (which is larger than the edge erase, so the edge erase is not visible). The background jpeg is slightly larger than 8.5x11, but only a few pixels (this is likely due to jpeg compression using 8x8 blocks). There is no evidence for an original larger than 8.5x11