1# in areas where pines are not real common, always look under the ones you come across. I've probably found a dozen over the years under pines.
#2 When you do find a "big" shed, mark the location and start making circles around the area. I've found that the larger the shed, the more likely you are to find the match within close proximity. Several times I have found one, and without moving my feet, looked around and seen the match. It doesn't always work, but very often it does.