Minn. Stat. § 386.47: OBSOLETE RECORDS, DESTRUCTION.

Any county board or the governing body of any municipality may by resolution authorize the destruction of the following instruments filed in the office of the county recorder of the county or clerk of the municipality:

(1) all satisfactions of chattel mortgages and releases of conditional sales contracts filed for record more than ten years; and

(2) all unsatisfied chattel mortgages and unreleased conditional sales contracts ten years after maturity; if no maturity date is shown, then ten years after the date of filing.