LCB
You have to remember that they choose where to hide from us . That they have the control of watching us and on how they will hide. So for us to go out looking for them when they do not want to be found is next to impossible. They are very watchfull of their surroundings and unless you have others who can help you in following you . You will never see them unless you have a way of using a decoy that they themselves will follow that will allow you to follow them. But even then they might even out smart you at that game as well.
I do think that they can live in small domains and still be undetected. They might even choose who they are willing to reveal them selves too as well when the time is right. As long as there is a food source and water the theory of them living in confined areas is true.