Cal. Penal Code § 28255

Commencing January 1, 2014, if after the conclusion of the waiting period described in Sections 26815 and 27540, the individual named in the application as the purchaser of the firearm takes possession of the firearm set forth in the application to purchase, the dealer shall notify the Department of Justice of that fact in a manner and within a time period specified by the department, and with sufficient information to identify the purchaser and the firearm that the purchaser took possession of.