So, you expect causation to be proved historically over a span of almost 4000 years? Sorry, all you'll get is correlation and a timeline...and the timeline indicates that the moral code of the Hebrews came later, and most likely borrowed from existing legal/moral traditions of the era.
We'll start back in ca. 2100BCE, with the
Code of Ur-Nammu.
That sounds familiar, and reading the examples is like reading Leviticus...
Then the
Laws of Eshunna:
Which would be similar, of course, to the layering of laws for the Levites, laws for the priests, laws for slaves, laws for Israelites, laws for dealing with foreigners...
Then we have the
Code of Hammurabi (ca. 1760BCE):
Again, that seems very familiar. These were written and formalized law codes a full 800-1100 years before the earliest estimates of the composition of the earliest parts of the Torah, the J passages.
J passages are estimated to have been compiled ca. 950BCE. Israelite morality and ethics are laid out within Mosaic law - it is, after all, the will of G-d.
So, we have earlier recorded legal/moral codes of the area which follow the same "If-then" pattern of Mosaic law, which call for monetary penalties in addition to corporal/capital penalties, which come from areas which the Israelites would have been familiar. Not causative proof, of course, because we don't have time machines, but it does indicate borrowing from other cultures rather than a single divine revelation.
After all...the Codes of Ur-Nammu and Hammurabi both claimed only mortal inspiration.