Missing sand skinks

I began checking my Sand Skink boards Tuesday after work. I got onlyl one possible hit, though it appears some of the board locations were not well chosen because the ground is too rooty. I may have to reposition a couple of them. Also, some of the boards in south fire lane have been moved. I wonder who has been moving through. The ground is too vegetated to see many tracks. Checked the north tract for dirt bike activity. There didn't appear to be any new tracks. Perhaps the signs worked.