There are several archeological sites that were the homes of the builders of the pyramids, who were Egyptian. IF the Israelites ever built any of the pyramids, it’s obvious that not all of them were built by them.
Number one, I specifically stated that it was the Middle Kingdom (not the Giza, Old Kingdom) pyramids, and number two, the worker (slave) village at Giza (or the one up in the hills by the Valley of the Kings) don’t have mailboxes, no one knows where the labor force came from.