Guiguzi was originally a secret book, but the two lost articles you refer to are Zhuanwan and Huanluan, and the other one is about how to distinguish them, which can be seen from Guiguzi's lost article quoted in Shuo Yuan Shan Shuo. The other is about how to choose a lobbyist in troubled times (the chosen lobbyist is usually a monarch). The content of this article can also be seen in Guiguzi's lost article quoted in Taiping Yulan Daozhi Department. "In this word" means to stop. The contents of the two articles are the main contents of the "success" part of Guiguzi lobbying system. Gui Guzi's ideological system consists of three parts: seeking things, saying things and achieving things. ) Because these two articles are so useful, it is probably because the descendants of Guiguzi don't want them to be passed down from generation to generation. Any secret book that is unwilling to be handed down from generation to generation has one reason or another.
Note: The ideology of Guiguzi refers to the ideology formed by the first eleven chapters of Guiguzi.