Lack of evidence is not as cut and dried as you may think! There is plenty of evidence if one knows where to look! The Ancient Egyptians left plenty of clues, we need only be smart enough to recognize them. Here is your first clue, and one thing for sure, they didn't leave information encoded using our current system of mathematics. They used unit fractions, Eye of Horace, binary mathematics, seked, cubits, palms, digits,
Changing ones perspective of things, allows things to change. I don't know who said it, but it is true, Perspective can make your problems larger or your solutions infinite.

Jacob