Why? Is your gun a matt Black finish now? If so, I'd leave it the way it is now. Turkeys can't tell the difference between a camo VS Matt Black gun. They "can" spot movement!!
I got some a few years ago, the only place i could get them was straight from Mossberg. Early 835s were different and you can find some camo but the newer ones can only be purchased from Mossberg, lest it has changed.