Mo. Rev. Stat. § 400.9-804: Security interest unperfected before effective date.

A security interest that is an unperfected security interest immediately before this act takes effect becomes a perfected security interest:

(1) Without further action, when this act takes effect if the applicable requirements for perfection under article 9 as amended by this act are satisfied before or at that time; or

(2) When the applicable requirements for perfection are satisfied if the requirements are satisfied after that time.