Mo. Rev. Stat. § 447.070: Goods retained until payment of charges.

When any goods, merchandise or other property shall have been received by any railroad or express company, or other common carrier, commission merchant or warehouseman, and shall not be received by the owner, consignee, or other authorized person, it shall be lawful to hold the same by said carrier, commission merchant or warehouseman, or the same may be stored with some responsible person, and be retained until the freight and all just and reasonable charges be paid.