I voted "never"...not sure why we would call the game warrden.

My game warden described it with a pretty good example. He has another group of hunters that will call him before they go spot lighting for hogs. This way, the game warden knows what is actually going on in case someone else mistakes the spot lighting activity for deer hunting and calls the game warden.
In my area unfortunatly, there are some hog doggers that will hunt a place without permission. If my game warden knows where I'm hunting, then he also knows where I'm not hunting. So if gates are taken off hinges and 4 whlr tracks are blazing across pastures on the other side of the county then he knows I wasn't there.
Game wardens have a pretty tough time monitoring every time someone crosses a fence line. If I tell the game warden the when and where of my hunt so he can make himself present if he so chooses, then I'm helping make his job a little easier. Helps build trust and in my case, is a win win for each of us. I de realize that someone hunting in the middle of a high fence 12k ranch has no reason to call ahead. That's why it's a poll, to see who out there does...