In Northern Alberta, we had some of the best hunting, in some of the absolute densest brush imaginable.
In another post here a while back, I said that you need to get into the thick stuff. Like thick enough that you don't fall down when you trip, kind of thick. That is where the rabbits hide out during the day, and is where they are comfortable.
I seldom shot at rabbits over ten yards, but ten yards is a LONG ways, in the dense bush.
If you are scouting, look for them to be out in the open at first and last light. My hunting partner had good results at last light, waiting along trails and at cleared edges, and shooting at longer distances.
Or you can set some snares. If you get the odd one, at least you know they are still there, eh?
Depending on where you are, snares can work, or not. One co-worker's kid stopped snaring rabbits because the coyotes were beating him to all his catches.
YMMV
Cheers
Trev