Fascinating.
We can actually see something written by Cleopatra, and we also have some letters (presumably written by) Bar Kochba.
Otherwise I don’t know that much else has survived, other than very much later signed documents by Byzantine emperors.
Almost everything not burned in the sacking of cities probably went into the fire on a cold night. Interesting idea that she touched it -- it would be amusing if her DNA survived on it. ;')