Mo. Rev. Stat. § 490.340: Certain recorded instruments to impart notice, when.

All records heretofore or hereafter made by the recorder of any county by copying from any instrument in writing or copy thereof affecting real estate at law or in equity, which instrument or copy is not entitled to be recorded because it is not certified or is defectively certified, shall from the date this section takes effect, or one year after the recorded instrument or copy is filed with the recorder for record, whichever date is later, impart notice of the contents thereof in the same manner and to the same extent as would an identical recorded instrument or copy which is duly certified. The certification referred to in this section includes not only certification of proof or acknowledgment, or other certification, but also verification, authentication, attestation, or any other condition precedent to recording made by law.