Mo. Rev. Stat. § 30.040

The treasurer shall not have possession or control of his office until he has taken the oath of office prescribed by the constitution and caused the same to be endorsed on his commission, and given the official bond required in section 30.020; and if he shall attempt under color of law to do or perform any official act or duty before complying with the provisions of this section, he shall forfeit five thousand dollars for the use of the state, to be recovered before any court of competent jurisdiction, without power in anyone to remit such forfeiture.