I would feel sure there are still deer in your area. Is the thick cover actually being used as a bedding area? Have you scouted other areas nearby for additional sign? Deer may be moving to other feeding areas, especially if acorns, beechnuts etc have started falling. I would spend a little more time checking these things out, and then make a decision where I want to hang my stand. Like hvyhitter says, it may be a little early to start seeing rubs, scrapes etc. Personally, when I start scouting, I look for the thickest, darkest area I can find. I then look for tracks and droppings that are both fresh and old. This tells me that deer were using this area and are currently using it. You may have seen 3-4 does a month ago, but how many have seen you or knew you were there without you realizing it? More than you think would be my bet.