I'd distance myself from him, but I'd never call the game warden on a neighbor. Them fuqkers wouldn't make many cases if they didn't get all their snitch phone calls. Pisses me off to see a guy get in more trouble for a game violation than if he committed a violent crime or is a drug dealer.
Would you call if he wasn't a neighbor?
If he was taking 10 deer a year out of the area you hunt? 20? More than 20?