Cal. Civ. Code § 2986.4
Any acknowledgment by the lessee of delivery of a copy of a lease contract or purchase order and any vehicle lease proposal and any credit statement which the lessor has required or requested the lessee to sign, and which the lessee has signed, during the contract negotiations, shall be printed or written in size equal to at least 10-point bold type and, if contained in the contract, shall appear directly above the space reserved for the lessee's signature. The lessee's written acknowledgment, conforming to the requirements of this section, of delivery of a completely filled in copy of the contract, and a copy of such other documents shall be a rebuttable presumption of delivery in any action or proceeding by or against a third party without knowledge to the contrary when he or she acquired his or her interest in the contract. If such third party furnishes the lessee a copy of such documents, or a notice containing items set forth in subdivision (c) of Section 2985.8, and stating that the lessee shall notify such third party in writing within 30 days if he or she was not furnished a copy of such documents, and no such notification is given, it shall be conclusively presumed in favor of such a third party that copies of the documents were furnished as required by this chapter.
Ca. Civ. Code § 2986.4