Mo. Rev. Stat. § 490.460: Copies of public contracts.

Copies of contracts entered into by individuals with the state, or any officer thereof, or with any county, or with any person for the benefit of any county, under or by authority of any law, or the lawful order of any court, the originals of which are, by law or the lawful order of any court, in the custody and keeping of any officer, duly certified and attested by the official seal of such officer, or, if such officer have no official seal, then verified by the affidavit of such officer, may be sued upon, and shall be received in evidence, to all intents and purposes, as the originals themselves.