Rauwolf & Clusius & Gessner

[N._N.]

While I agree that it is likely that the VMS remained in one place for much of its pre-1600 history, you can hardly base this argument on the non-existence of correspondence by certain people. There are just too many possible reasons why no letters survived or why a person chose not to write extensively on the manuscript. Be it due to their own paranoia or WW2 destruction... Only on a larger scale, i. e. over all the years it is unaccounted for without, to my knowledge, any reasonable cases for references, do the probabilities add up against a wider circulation. 

With that being said, digging deeper into known acquaintances of Rauwolf, Widemann etc. seems like an interesting project anyway. Not only for the sake of finding out more about the VMS, but simply because it is an interesting scholarly, political and religious environment to research. Rauwolf has drawn significant attention over the centuries due to his travels, but that's not necessarily true for others named in this thread.