Oh, I know about hieroglyphics. But they have paintings of what is supposed to be a funeral procession in a tomb. It is not writing. It is the caricature of the human form that you expect from children.
Somehow, this was “enough” for them. It said what they wanted to say, while they built the Pyramids around it. I find it strange.
Two thousand years before the Greeks were carving their naturalistic sculptures out of marble (Mohs scale of 3), the Egyptians carved this from gneiss (Mohs scale of 7, the same hardness as granite and steel).
I can't say why Egyptian art seemed to become more stylized over the centuries, but they certainly had the ability to make naturalistic art when the wanted to.
Part of the video involves pounded in glyphs.
Close examination reveals that the etchings found elsewhere were probably made at a later date and not by those who made the box. The quality of the etching workmanship is of much lower order than the box.
I may be straying into the scope of a separate video for this observation