Mo. Rev. Stat. § 490.480

Copies of all bonds required by law to be given by executors, administrators, personal representatives, guardians, conservators and commissioners, for the faithful discharge of their duties as such, and the bonds of principals and sureties required to be taken in the course of any judicial proceeding in any of the courts of this state, duly certified by and attested with the seal of office of the officer to whom by law the custody of the same is committed, shall be evidence, to all intents and purposes, as the originals themselves.