Cal. CCP § 570

A receiver having any funds in his hands belonging to a person whose whereabouts are unknown to him, shall, before receiving his discharge as such receiver, publish a notice, in one or more newspapers published in the county, at least once a week for four consecutive weeks, setting forth the name of the owner of any unclaimed funds, the last known place of residence or post office address of such owner and the amount of such unclaimed funds. Any funds remaining in his hands unclaimed for 30 days after the date of the last publication of such notice, shall be reported to the court, and upon order of the court, all such funds must be paid into the State Treasury accompanied with a copy of the order, which must set forth the facts required in the notice herein provided. Such funds shall be deemed to have been received by the State under Chapter 7 (commencing with Section 1500) of Title 10 of Part 3 of this code and may be recovered in the manner prescribed therein.

All costs and expenses connected with such advertising shall be paid out of the funds the whereabouts of whose owners are unknown.