California Code, Insurance Code - INS § 950

Whenever such a depositing insurer has paid, canceled, or reinsured all its unexpired policies outstanding in this State, and all its liabilities under such policies are extinguished, or assumed by other responsible insurers, it may apply to the commissioner for return of its deposit. Such application shall be in writing and verified. If on such application, and from an examination of the books of the insurer and of its officers under oath, the commissioner is satisfied that all of its policies are so paid, canceled, extinguished, or reinsured, he shall deliver up to the insurer the securities deposited.