I wish I remembered that expert's name, sorry. But he said that though the font and the fact that Word reproduces the document exactly, the KILLER CLUE that the docs are forgeries is the spacing between the lines.
He said that even on the variable spacing typewriters avaible back then (though they were complicated and needed special training to use), the between line spacing was absolutely FIXED. It could be 13, 14, or 15 (I forget the unit of measurement) but NEVER a fraction of them. He did some kind of thing in his lab to reproduce on paper what he found in the PDF file and measured it, and the between-line spacing was indeed a fraction #.
Without seeing the original typewritten, handsigned document, SeeBS verified nothing except the quality of a photocopy of a "good" forgery.
See #517 to add to your list.
When a document is copied once or several times, it is reduced by a fraction. That is why you don't get edge lines when you copy. This document was copied many times so the line spacing will not be true. Measuring line spacing from a copied document is a waste of time.