Mine was installed inside the trunk

with the instruction to remove the holder and plate OR when the car came in for service that it would be installed.
The law in California requires that the plate and mounting stuff to be available when the car is purchased. It doesn't go so far as to make it be installed.
Front License Plate Bracket
11713.17. (a) Following the retail sale or lease of a motor vehicle for which the department issues two license plates, a dealer may not deliver the motor vehicle unless either of the following occurs:
(1) The motor vehicle is equipped with a bracket or other means of securing a front license plate.
(2) The dealer obtains a signed written acknowledgment from the person taking delivery of the motor vehicle acknowledging both of the following:
(A) The person expressly refused installation of a bracket or other means of securing the front license plate.
(B) The person understands that California law requires a license plate to be displayed from and securely fastened to the front of the motor vehicle and that the hardware necessary to securely fasten the front plate is available from the dealer.
(b) A manufacturer or distributor may not sell or distribute in this state a new motor vehicle for which the department issues two license plates, unless that motor vehicle is equipped or provided with a bracket or other means of securing the license plates.
Added Sec. 1, Ch. 365, Stats. 2004. Effective January 1, 2005.
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LL