Mo. Rev. Stat. § 271.160: Failure to reclaim, property vests in taker-up, when.

If the owner fail to reclaim any stray taken up and posted in accordance with this chapter, within one year from the date of taking up, then the title thereto shall vest absolutely in the taker-up; provided, that if said property shall have been appraised at twelve dollars or more, the title thereto shall not vest in the taker-up till after the payment into the county treasury by him of a sum equal to one-half of the remainder left after deducting the total amount of fees due according to sections 271.320 to 271.350.