Freethink December 25, 2021 Built of roughly 2.3 million limestone and rose granite stones from hundreds of kilometers away, it's long posed a couple of vexing and fascinating mysteries: How did the ancient Egyptians manage to get all of these stones to Giza, and how did they build such a monumental object? All sorts of exotic ideas have been floated, including assistance from aliens visiting earth. Now, as the result of an amazing find in a cave 606 kilometers away, we have an answer in the form of 4,600-year-old, bound papyrus scrolls, the oldest papyri ever found. They're the journal of one of the managers who helped build the great pyramid. It's the only eye-witness account of building the Great Pyramid that's ever been found. I don't know why I had not heard of this before...the article is a year old.
Yeh, I realized the article was somewhat click-bait after I posted it. Wiki has a page on The Diary of Merer, the manager referred to in that article. It discusses the 4 found papyri. You can search on "Merer Papyrus" and find other articles titled "Ancient Papyrus Of Merer Reveals How The Great Pyramid Of Giza Was Built" while what is really discussed is how they Egyptians built the waterways to transport the materials to the site.