Hi,
I would really need a bit more information before anything could be said about the scroll... do you have a link to it?
That said, the only "true" copies of the Densho for Togakure Ryu (or the other Ninjutsu-related arts, for that matter) would be those held by the current headmaster/s of the system/s or branches (Hatsumi Sensei, Tanemura Sensei, or a few others). Other versions would most likely be simply either copies (probably personal interpretations), or just outright fakes.