Voynich buys some Jesuit manuscripts

[ReneZ]

With the publication of a new paper on this topic, much of the story has been clarified.

So, the Voynich MS was NOT at Villa Mondragone.
This was Kraus' guess based on the very limited information he had, and he guessed wrong.

He can be excused for that, because the details of the sale of these Jesuit manuscripts have been kept a well guarded secret by all parties involved. Only a handful of people at the time knew.
Even Ruysschaert most probably never knew these details. His 700-page catalogue is completely silent about this question.

Voynich probably made his purchase around April - May whereas the Vatican bought the remainder in June - July for 50,000 Lire. The books were kept in the Villa Torlonia in Castel Gandolfo, as I long suspected.

The above-mentioned Franz Ehrle visited Villa Torlonia on 24 June 1912, in order to estimate the value of the collection. Of the people working in the Villa, only the rector of the Jesuit seminary knew why he was there.
He sent his estimate to Pope Pius X, who agreed on 8 July.
Boxes from Villa Torlonia arrived in the Vatican on 12 July.

There are not so many details about Voynich's purchase, except that Joseph Strickland visited the same villa on 25 and 29 April 1912.