RE: How many go unseen ?
This is a tough question, I think it is nearly impossible for a buck to go unseen by SOMEONE. It may not be a hunter that sees it, maybe a farmer or even just a lucky passer by, but I think that someone has to lay eyes on him. My buddy's mother drives bus for the local school and she always fills us in on where the big boys are.
As far as hunters go, I would say theres a pretty good chance thats a buck could go unseen by hunters. 95% of the guys around me do all their scouting the weekend before the opener then have at it. Im scouting all summer long, but even I cant cover everything, so its possible.