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.
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Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.