Mo. Rev. Stat. § 67.840: Request for notice expires, when, renewed, how.

The request for notice provided in section 67.810 shall expire five years following the date that the affidavit is filed, and ten days prior to such expiration date the clerk with whom the affidavit was filed shall return the affidavit to the nonresident property owner with notification that the request for notice can be renewed upon a renewed compliance by the nonresident property owner with the provisions of section 67.810. The clerk shall return the affidavit together with such notification in the self-addressed envelope provided by the nonresident property owner pursuant to section 67.810.