It is very difficult if not impossible to determine what and how things were exactly recorded thousands of years ago. You probably know, however, that it was traditional practice that the scribes were fastidious in copying. I am not a scholar in these matters, and I do read about them sometimes, but I also believe that not that many errors have crept into the transmission of the original scrolls that would make me think they did not reflect the reality of what was happening. Or what God wants his people to know. For instance, the Masoretes were those scribes and scholars that were fastidious in copying the scrolls. "The Masoretes, themselves, recognized the inherent possibility of human error when copying the Hebrew Bible. They attempted to combat errors by adding innumerable notes —
masorah — in the margins of manuscripts to safeguard the text. Where they found differences between texts, they determined which opinion was correct."
Did Scribes Faithfully Transmit Old Testament Manuscripts? - Josh.org.