The Modern Forgery Hypothesis

[Jorge_Stolfi]

As far as I can tell, it folds nicely into a pocket, similar to the first two examples although the wax would have been completely inside.

Apart from the folding, there is the problem that, AFAIK, the lining of the front cover was removed by Wilfrid and eventually replaced by a new blank sheet.  If so, any stains on the new lining will not be evidence that the letter was originally attached to the book.

(And besides I wonder if 400-year-old seal wax can still stain anything.)

All the best, --stolfi