Mo. Rev. Stat. § 379.185
Whenever any loss or damage shall be suffered in this state from fire, by any person, persons or corporation, upon property insured under a policy of insurance of any fire insurance company doing business in this state, and notice of the fact that such loss or damage has occurred shall be given by the person, persons or corporation incurring the same, or the agent thereof, to the insurance company issuing such policy, or to the agent thereof nearest the place of loss, within a reasonable time after the date of such loss or damage, the limit to which reasonable time shall be mentioned in said policy and made a part thereof at the time of issuing the same, but the time fixed in the policy shall not be taken or construed to be a condition precedent to the right of recovery, then it shall thereupon become the duty of such insurance company to furnish to the person, persons or corporation incurring such loss or damage, such blank forms of statements and proofs of loss as such insurance company may desire to be filled out, in regard to the time, origin and circumstances of the fire causing such loss or damage, and the knowledge and belief of the insured touching the same, the lists and description and quantity of property destroyed or damaged, and of property saved and the original cost of such property, and the cash value thereof at the time of the fire, the details as to possession, ownership, title and encumbrances, and changes of title, use, occupation, possession, ownership, location and exposures since the time of issuing such policy, if any, and other insurance, if any, and description and schedules in such policy.
§ 379.185, RSMo