Jack:
Just my opinion but if you know one is in the pen, it's not hunting any more. It's chasing one you know is in the pen.
The size of the pen just determines the time you need to chase it.
I hear people say that all the time when ever this topic comes up. I get a chuckle when I read "opinions" like this one.
Lets say you look at a map of unit ABC in New Mexico. You know there are elk in there so since you "already know" I guess its just a matter of time before you kill one, right?? I mean all your doing is "chasing one you know is there" and the size of the unit "just determines the time you need to chase it". So I guess its not much of a trophy and/or your not a "true" hunter, right?
Just because there is an 8 foot fence around the property unstead of a 4 footer dosent mean the hunting is simply and/or the game is suddenly tame.