California Code, Probate Code - PROB § 1864

(a) In the case of the conservatorship of an absentee as defined in Section 1403, the petition to terminate the conservatorship may also be filed by any officer or agency of this state or of the United States or the authorized delegate thereof.

(b) If the petition states and the court determines that the absentee has returned to the controllable jurisdiction of the military department or civilian department or agency concerned, or is deceased, as determined under 37 United States Code, Section 556, or 5 United States Code, Section 5566, as the case may be, the court shall order the conservatorship terminated.  An official written report or record of such military department or civilian department or agency that the absentee has returned to such controllable jurisdiction or is deceased shall be received as evidence of such fact.