Keep at it. You will eventually start finding antlers and then will develop some spots that you can return to each year. I don't know how much the trail cameras will help you for locating antlers at this point. The blacktails dropped their antlers in jan-feb and I believe the majority of the bulls are dropped as well. Remember, google earth is your best friend. Look for spots that you believe look like good deer/elk terrain and put your boots to the ground. Once you find one antler, its probably safe to say that their are more nearby. As you know, the bulls and bucks form bachelor groups while they are shedding. Let me know if I can be anymore help to you. Its hard to get rolling with shed hunting but eventually youll expect to find a shed every time you hit the woods.