Mo. Rev. Stat. § 513.150: Personal property to be delivered to purchasers — bills of sale thereof given, when.

When the purchaser of any goods or chattels shall pay the purchase money, the officer selling the same shall deliver him such property, and, if desired, shall execute an instrument of writing, testifying the sale and payment of the purchase money, and conveying to such purchaser all the right, title and interest which the debtor had in and to the property sold, on the day the execution was levied thereon.