Mo. Rev. Stat. § 28.060

He shall keep in his office an abstract of all commissions issued and appointments made by the governor, and shall register therein the substance of each commission, specifying the name of the person appointed, the office conferred, the district or county for which the appointment is made, and the term of office; and when any office shall become vacant he shall enter, in a space to be left for that purpose, a memorandum of such vacancy and the occasion thereof, with a reference to any evidence deposited in his office.