Could there be more documents written in voynichese ?

[ReneZ]

The collections in the Vatican are enormous. Indeed, the most recent knowledge of the whereabouts of the Voynich MS when Wilfrid acquired it derive from archival material in the Vatican, that was studied only two or so years ago. 

Certainly, not all of its material is accessible even to researchers, for example when it has not yet been properly organised. That is also the case for material related to the Jesuit library that held the Voynich MS and we need to wait. (The source for this information is You are not allowed to view links. Register or Login to view.).

For the Voynich MS, anything related to its earlier history will not be in the Vatican. The MS has travelled a lot and its origins are not certain