This was not in reply to a post of mine but I wanted to weigh in. Actually quite a lot of copper tools have survived from the Old Kingdom, mainly in the form of chisels of different sizes. Stone tools also were commonly used, so I agree with you there, but fine angles and fittings in masonry were achieved with chisels. In addition, from all periods the Egyptians used pull-saws for cutting blocks of masonry. Copper deposits in Egypt contained natural high quantities of arsenic, which produced rather hard and durable copper implements. Perhaps even by the Middle Kingdom bronze tools were becoming more common. Although tin deposits in Egypt were uncommon for the smelting of bronze, Egypt either directly controlled or traded with polities in Syro-Palestine to get the tin they needed for bronze production. Bronze was definitely a common part of life in Egypt by the New Kingdom. But prior to this time copper was used in all sorts of things, including tools, weapons, furniture, and jewelry.
I've discussed the Inventory Stela quite a few times in threads at UM through the years, but what do you mean specifically by its implications?