I remember being surprised that
the first word on f1r is not found again in the whole
MS, even some character combinations in that word
are not found again.
You must admit that character combinations at the very start of page one
that don't appear elsewhere sound suspiciously like a key sequence. :-/
Especially written immediately after a large-ish gallows. :-)
Perhaps statistically identifying similar blocks of unusual character
combinations could be a way of finding plausible key sequences within the text?