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Once you've figured out where / what his brothers are, this one may be easier...(though you can do this one all by itself).
You'll arrive at Payson High School (beware of muggles going to and from school), and head south along Main Street. Follow the coordinates, and you'll be looking for something that you'll see lots of, especially in the fall. You'll need a tweezers or toothpick for the log in this one.Â
Once you find the cache, make sure to twist the lid off (this will make sense once you find it)