Okla. Stat. tit. 15, § 443

An involuntary bailment is made: First. By the accidental leaving or placing of personal property in the possession of any person, without negligence on the part of its owner; or, Second. In cases of fire, shipwreck, inundation, insurrection, riot, or like extraordinary emergencies, by the owner of personal property committing it, out of necessity, to the care of any person.