Mo. Rev. Stat. § 411.135
Every licensed warehouseman desiring to issue unregistered negotiable or nonnegotiable warehouse receipts shall act as registrar, or designate an employee to act as registrar, to be responsible for issuing warehouse receipts and keeping all records in a manner as provided by the director. The warehouseman's signature or that of his employee shall be affixed and kept on file with the director. The warehouse record shall clearly identify scale tickets, weight and grade certificates, used as a basis for issuance of each warehouse receipt. A copy of the scale tickets and the weight and grade certificates shall be kept on file as a record in the warehouseman's office for a period of at least three years after the date of cancellation of the warehouse receipt.
§ 411.135, RSMo