Well, the graffiti from the sinai mines, made by slaves, mention Moses and a lot else.
Google “sinai inscriptions”, then “images”, to see them; and read them in modern Hebrew and then in English translation.
And see the book “The World’s Oldest Alphabet”, by Petrovich.
I have looked at all that stuff in my research...in fact, I’ve written a book on the Exodus (got a publishing deal in the works but it hasn’t come out yet).
Of course, the title is a rhetorical question. I thought the “multiple authors” theory of the Torah needed to be addressed.