Voynich was well known for buying his stock on the continent, directly from monasteries, libraries and similar collections, at least until 1914 (World War I).
Only a very small fraction of all this is likely to be recorded in the Schoenberg database.
After 1914, his business became much more difficult, but he could survive for quite a while because of some of the sales of his jesuit manuscripts.
Also, the Schoenberg database has primarily been populated from catalogues.
He sold several manuscripts to Kane (like the one you found) and at least one other was from another book dealer and appears in this other dealer's catalogue. I have this information directly from the Princeton curator, and the actual sale does not seem to have been recorded in any auction. This is Kane MS 28, for which You are not allowed to view links. Register or Login to view. .
(Your entry for the 1 MS he bought cannot be found in this though).
Edit:
I got a bit curious. The volume could match Kane MS 46, since the first book in this MS is 'Historia Romana'.
This entry is present in the Schoenberg catalogue in multiple instances, which have been conveniently collected here:
You are not allowed to view links. Register or Login to view.
Note how Voynich is mentioned in only one of them.
Only a very small fraction of all this is likely to be recorded in the Schoenberg database.
After 1914, his business became much more difficult, but he could survive for quite a while because of some of the sales of his jesuit manuscripts.
Also, the Schoenberg database has primarily been populated from catalogues.
He sold several manuscripts to Kane (like the one you found) and at least one other was from another book dealer and appears in this other dealer's catalogue. I have this information directly from the Princeton curator, and the actual sale does not seem to have been recorded in any auction. This is Kane MS 28, for which You are not allowed to view links. Register or Login to view. .
(Your entry for the 1 MS he bought cannot be found in this though).
Edit:
I got a bit curious. The volume could match Kane MS 46, since the first book in this MS is 'Historia Romana'.
This entry is present in the Schoenberg catalogue in multiple instances, which have been conveniently collected here:
You are not allowed to view links. Register or Login to view.
Note how Voynich is mentioned in only one of them.