Here in maine, I have seen the same thing as well. I am not sure if it is because of coyotes or moose driving them around. They will make a scrape and not be back for 5 or 6 days. It is hard to catch them in the same scrape as the just keep moving around so much. They also do not appear to be attracted to any scents either.. I did find a couple of rubs to go with the scrapes though.