California Code, Probate Code - PROB § 11428

(a) If an estate is in all other respects ready to be closed, and it appears to the satisfaction of the court, on affidavit or evidence taken in open court, that a debt has not been and cannot be paid because the creditor cannot be found, the court or judge shall make an order fixing the amount of the payment and directing the personal representative to deposit the payment with the county treasurer of the county in which the proceeding is pending.

(b) The county treasurer shall give a receipt for the deposit, for which the county treasurer is liable on the official bond. The receipt shall be treated by the court or judge in favor of the personal representative with the same force and effect as if executed by the creditor.

(c) A deposit with the county treasurer under the provisions of this section shall be received, accounted for, and disposed of as provided by Section 1444 of the Code of Civil Procedure. A deposit in the State Treasury under the provisions of this section shall be deemed to be made under the provisions of Article 1 (commencing with Section 1440) of Chapter 6 of Title 10 of Part 3 of the Code of Civil Procedure.