Cal. Penal Code - PEN § 33800. Section 33800.
(a)
When a firearm is taken into custody by a law enforcement officer, the officer shall issue the person who possessed the firearm a receipt describing the firearm, and listing any serial number or other identification on the firearm.
(b)
The receipt shall indicate where the firearm may be recovered, any applicable time limit for recovery, and the date after which the owner or possessor may recover the firearm pursuant to Chapter 2 (commencing with Section 33850).
(c)
Nothing in this section is intended to displace any existing law regarding the seizure or return of firearms.