Mo. Rev. Stat. § 386.145

The chairman of the public service commission may destroy by burning, or otherwise dispose of as ordered by the public service commission, such records, financial statements and such public documents which shall at the time of destruction or disposal have been on file in the office of the public service commission for a period of five years or longer and which are determined by the public service commission to be obsolete or of no further public use or value, except such records and documents as may at the time be the subject of litigation or dispute.