Mo. Rev. Stat. § 521.810

No objections to the security in any such indemnification bond shall be allowed if the same be not made by or for the party interested therein in writing within the first six days after the return days of such execution or attachment, unless the time for making such objections be extended for good cause by the court, and all of said objections shall be made in the court to which such writ is returnable and not elsewhere.