Cal. Civ. Proc. Code § 1352

(a) Whenever unclaimed money or other property is deposited in the State Treasury under this title, and, except as otherwise provided by law, whenever there is in the possession of the state or its officers any money or other property which is held for third persons or the title to which has vested in the state subject to the rights of third persons, and the period during which it may be claimed by a person entitled thereto has not terminated, the period and person being prescribed by law, if the value of the money or other property to which the claimant is entitled is less than sixty thousand dollars ($60,000), any such person may present his or her claim for it to the Controller.
The claim shall be made in the form prescribed by the Controller, which shall set forth the information required by Section 1355 or any other information that the Controller may deem necessary to establish right or title to the money or other property in the claimant.
(b) Property assigned or distributed to a name distributee may be claimed by the distributee himself or herself or his or her legal guardian or conservator, as provided in subdivision (a) regardless of the amount. This subdivision does not apply to the heirs or estate of a distributee, or to property distributed to the state for lack of known heirs.
(c) Any person aggrieved by a decision of the Controller may commence an action, naming the Controller as a defendant, to establish his or her claim in the superior court in any county or city and county in which the Attorney General has an office pursuant to Section 1541.