Could there be more documents written in voynichese ?

[dashstofsk]

I think its more likely than not that there were more books

I think we can safely assume that the alphabet is an invented one, and that the Manuscript is the only one that uses it. Any similar manuscript at any time in its history would have aroused the same curiosity, with each owner in turn being equally puzzled by it. News of such another rare and remarkable manuscript would have spread and it would have already come to light.