I think this is another case, like slave narratives, where there is no proof that will be acceptable to anyone who has already decided what box they'd like the subject person to fit in. He's illiterate and can't write his story himself - then there is no story. He's illiterate but tells his story to a contemporary - then it can't be true because the contemporary has an agenda and the subject can't read what was written. He writes or tells his story in old age - then it can't be true because he's senile and demented. He writes his own story - then it can't be true because he lies.
If your library takes part in The Human Library project, then I'd suggest stopping by when they're offering the program to see if any of the human "books" available is a transgender person. People who take part in The Human Library as "books" are willing to talk about their life experiences with you. They're willing to answer tough questions you might otherwise be afraid to ask. In this case, questions like: When did you first know you were trans? How did you know you were trans? What's it like to be trans? Did your folks or somebody else do something to you that made you trans? Can you stop being trans? If you identify as one sex, can you still like to do things that are usually associated with the sex you were assigned at birth? You get the idea.
Dear lady, I deeply apologize if I have somehow offended.
I freely confess that little in my life has exposed me to much about the transgender experience. I'm a small town person with a small town library that takes part in nothing of particular note. Nor could I ever engage in questioning someone as invasively is that. I simply try to approach everyone I meet with kindness and respect.
I have the utmost respect for Albert Cashier. I don't discount or dismiss any part of his experience. My main observation has been that his experience is filtered entirely through the lens of others who, as you suggest, may have their own agenda or perspective.
Newspapers gave wing to some wild flights of fancy, while depositions in his pension file by people who knew him in earlier life were filtered largely through a lens that asked, "Did you notice anything weird about Albert?" That gives an incomplete and narrow view of him as a human being.
When I wrote this post, I was not thinking about his gender identity at all. That has been written about in quantity, and at length, by those vastly more qualified than I. In conversation on this post, I simply tried to follow and partake of the discussion as well as I could.
In writing the original post, I was contemplating the physical and lived experience of being a human in a female body, (however they perceived or identified themselves,) plopped down amidst the robust, possibly intimidating, potentially dangerous reality of several hundred testosterone-laden young men at war.
Albert was a remarkable human who lived a bravely unusual life. By digging up little glimmers and scraps of how others saw Albert, the person, I'm hoping to learn more about that.
Again, I am deeply sorry if I have misspoken or offended. Perhaps I should not have begun this topic at all.