Well that is fairly easy to prove. Lets get an expert in ancient Egyptian language examine the tablets ...
Oh wait ...
No no NO! REFORMED Egyptian!
You see, one day, long ago; long before the Romans and the Greeks and the Hittites and the Philistines roamed the Earth - there was a young Egyptian boy - Yusef Shehata - who was running along the banks of the Nile one day; after escaping from the Teachers grasp.
He was so tired from having to learn to carve hieroglyphics into the student sandstone slabs everyday; working for perfection; perfection needed to be able to claim the title of Master Engraver of the Pharaoh.
"If ONLY there were an easier way!", he cried into the cobalt blue sky of the verdant valley: hundreds of miles long, but only a few thousand cubits wide.
Exhausted and exasperated, he sat on the bank; cooling his heels in the water while keeping a watchful eye for the crocs: Gods of the Waters. Yes; being consumed by one is a sure sign of blessing; but this day young Yusef did not feel so blessed; as his only burning was of his arches: not his busom.
Later, as he had recovered some strength; he climbed high into a palm tree to procure a prized coconut - one sure to be brimming with cool, delicious milk.
Reaching out to one, he tugged on it, only to find it secure. Tugging and yanking harder, he slipped and fell onto the sand below.
Cursing his luck (but noticing no actual physical harm) he looked upward to find his prize HAD come loose and was now a mere arms-length above his head.
Evening was nigh, as he regained consciousness, cracked open the coconut and drank his fill.
As he was preparing to leave for home (all the while devising yet another tale to explain his absence to his harried mother) two foreign visitors were suddenly by his side. They said they were a Father and Son - sent to Yusef in response to his earlier cry. They relayed a message to him to dig under the trunk of the tree to find a new system of writing: writing to reform the complicated language of the Nile, engraved on Golden Metal: the Metal of the GODS.
As in countless other days, Yusef's mother did not believe him and beat him as usual; sending him to bed without his supper of beloved camel stew: the Meal of the Peasants.
Unable to sleep; unbelieved by his family; sure to be severely punished by his Master - Yusef gathered his few belongings and fled silently in the night; down the river of his heritage and into the foreign land of the Jews - never to be heard from again...