My experience here lately is this, if we see the hogs before dumping the box we get outrun 9 out of 10 times it seems especially if the hogs know they have been seen.
Always heard this from the old timers and I agree! Whenever we see incidental hogs while hunting we almost NEVER catch that hog.. Even seen it with groups of hogs. I'm sure it differs from area to area, I can see it being much easier in open country to do