Uh, the Valley of the Kings was only actively used for a comparatively short period throughout Egypt's entire history. What does it have to do with this? What do you think Egyptians did with their kings before the Valley of the Kings was established and after it ceased to be used?
> First of all, nobody knows who built them, how they were built, nor why they were built.
> and despite the Egyptians documenting everything, there are no claims by them that Khufu or anyone else in their documented history built the Pyramids.
https://www.livescience.com/55439-ancient-logbook-on-great-p...
> Over a period of several months, [the logbook] reports — in [the] form of a timetable with two columns per day — many operations related to the construction of the Great Pyramid of Khufu at Giza and the work at the limestone quarries on the opposite bank of the Nile
I guess this Merer guy is one of those you were looking for.