Cal. Fish & Game Code § 4657

The holder of a wild pig tag shall keep the tag in his or her possession while hunting wild pig. Before the taking of any wild pig, the holder of a wild pig tag, except for wild pig tags issued through the Automated License Data System, shall legibly write or otherwise affix his or her hunting license number to the wild pig tag. Upon the killing of any wild pig, the date of the kill shall be clearly marked by the holder of the tag on both parts of the tag. Before transporting the pig, a tag shall be attached to the carcass by the holder of the tag. The holder of the wild pig tag shall immediately, upon harvesting a pig, notify the department in a manner specified by the commission.