California Code, Code of Civil Procedure - CCP § 1561

(a) If the holder pays or delivers escheated property to the State Controller in accordance with this chapter and thereafter any person claims the property from the holder or another state claims the property from the holder under that state's laws relating to escheat, the State Controller shall, upon written notice of such claim, defend the holder against the claim and indemnify him against any liability on the claim.

(b) If any holder, because of mistake of law or fact, pays or delivers any property to the State Controller that has not escheated under this chapter and thereafter claims the property from the State Controller, the State Controller shall, if he has not disposed of the property in accordance with this chapter, refund or redeliver the property to the holder without deduction for any fee or other charge.

(c) As used in this section, “escheated property” means property which this chapter provides escheats to this state, whether or not it is determined that another state had a superior right to escheat such property at the time it was paid or delivered to the State Controller or at some time thereafter.