If I this system existed, and I knew where possible spots were, I'd go to all of the hardest spots first just to make it less likely that my wand would pop up there. Then I could start going to all of the easier spots now that my odds of finding it there are better. Basically, the first 10 spots I look in, there's only a 31% chance of finding my wand there. So if you do the easy ones first, you are blowing your chances at an easy wand spot.