Cal. Code Civ. Proc. § 1611
Any person, whether or not named in the petition, may within 15 days after completion of notice respond to the petition by answer describing the property, asserting an interest as owner or successor, and declaring an intention to claim the same from the United States under the laws of the United States. Such answer shall not be filed unless accompanied by the sum of ten dollars ($10) for deposit in court, and no other answer or response shall be filed by or on behalf of a claimant. The court shall strike from the petition and dismiss from the proceeding all property described in the answer. The funds on deposit shall be transmitted by the court to the Controller and shall be received for deposit in the abandoned property account in the Unclaimed Property Fund as total reimbursement for costs and services expended on behalf of the claimant. Such dismissal shall be without prejudice to a subsequent petition should it appear that the claimant is not entitled to the property, and the interest asserted in said answer shall not thereafter be asserted against the State.
Ca. Civ. Proc. Code § 1611