Voynich buys some Jesuit manuscripts

[ReneZ]

By the same token, Voynich was not at all unusual in obfuscating the source of the VMS or any other manuscript. It was not at all uncommon for dealers during that period to refuse to say where they had acquired something.

I do not doubt for a second that this is correct, but ELV's letter, to be opened after her death, already shows that this is quite an extreme case.