Mo. Rev. Stat. § 426.040

It shall be the duty of the circuit court in whose clerk's office such inventory may be filed to appoint two or more disinterested and competent persons to appraise the property, effects and things so inventoried; provided, that such appraisers may be appointed before the filing of the inventory and may accompany the assignee and make said appraisement at the time of the making of said inventory, and said inventory and appraisement may be made out upon one paper with the affidavits of the assignee and appraisers thereto attached.