Let’s say somebody — over there and back then — brought it across the Atlantic and eventually Chief Joseph got a hold of it.
Why would someone bring an old sheep receipt all the way across the water? And Sumer wasn’t exactly on the coast of Africa either. Not as if someone just took the wrong fork in the current and wound up thousands of miles from his local distributor.
They’re asking us to believe this doodad crossed Africa as well as the Atlantic and North America too!
It would need to have changed hands a LOT of times and possibly across a LOT of different tribes and cultures, in two hemispheres, and documents an exchange 4000 years ago. For much of that time, no one knew what it said.