If you don't feel like it is being dealt with appropriately you could call the Sheriff's, CHP or the State Attorney General's Office.
How much is that camera worth? A quick Google search says in order for a crime in California to make Grand Theft status it has to be valued at $950+.
Even if the camera was a $10 one the guy should be prosecuted.
Agreed. The OP stated anyone other than the game warden would have been charged with a felony of Grand Theft. Unless the camera is valued at $950+ it isn't Grand Theft. Just informational in case the OP didn't know or understand the law.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.