Mo. Rev. Stat. § 442.240: Such instrument, filed for record, to impart notice.

Every such instrument which has been filed for record or recorded in the proper office, although such filing or recording may not have been in accordance with any law in force, shall hereafter impart the same notice as if the same had been filed or recorded in accordance with law; and all such deeds hereafter filed or recorded shall, from the time of filing or recording the same, impart the same notice as if the same had been acknowledged or proved and filed or recorded in accordance with the laws regulating the acknowledgment or proof of such instruments executed within this state.