100 sheets of stolen vellum

[JustAnotherTheory]

The parchment (not "vellum"; "vellum" is a specific kind of parchment made from very young calves, which this isn't) used for the VMS is extremely poor quality, thick and full of flaws and holes. It is also untrimmed. This kind of parchment would not have been produced in or for a professional or monastic scriptorium. I suspect that the parchment was made by and for whatever community produced the manuscript - not purchased, and not stolen.

That is very insightful, thank you. It's quite a blessing to have actual experts chime in.

So when you say "I suspect that the parchment was made by and for whatever community produced the manuscript", are you implying that the tanner him/herself had knowledge of what the parchment would be used for? I.e., he/she was "in on it"?