Minn. Stat. § 370.14: BOUNDARIES RESTORED AFTER DETERMINATION.

If the territory detached from the county by the change of boundaries is restored to it by the final determination of the courts as a result of a contest or other litigation concerning the change of boundaries of the county, after the appointment or election of the commissioner or commissioners at large, the term of office of each commissioner at large shall terminate immediately after the election or appointment and qualification of a commissioner for the district of the former commissioner whose place on the board is occupied by the commissioner at large. If the term for which the former commissioner was elected has not expired, the former commissioner shall, within 30 days after the final determination restoring the district to the county, qualify as required by law and hold office for the remainder of the term. Otherwise the vacancy shall be filled by appointment as in other cases.