Mo. Rev. Stat. § 447.537: Owner of property in another state and holder subject to that state's jurisdiction, effect.

If specific property which is subject to the provisions of sections 447.505, 447.520, 447.527, 447.530 and 447.535 is held for or owed or distributable to an owner whose last known address is in another state by a holder who is subject to the jurisdiction of that state, the specific property is not presumed abandoned in this state and subject to sections 447.500 to 447.595 if:

(1) It may be claimed as abandoned or escheated under the laws of such other state; and

(2) The laws of such other state make reciprocal provision that similar specific property is not presumed abandoned or escheatable by such other state when held for or owed or distributable to an owner whose last known address is within this state by a holder who is subject to the jurisdiction of this state; provided, however, such other state shall only enforce its claim by trial de novo in the appropriate court in Missouri.