When this building opened for the 1954 school year, five teachers waited to welcome incoming students -- all 100 of them. Today, this building still stands and still welcomes children through its doors...but for recreational purposes only.
Once you've found the building, head towards the diamond in its backyard.
Find two almost-buried balls, near where a single would land you.
From there, walk 58 steps east and 8 steps south.
Wave hello to Wilbur...
Now find something that no longer fences anyone in, and look below the hollow pipe.
Did you find this box? What did you think of the stamp inside? Was it well hidden? Any issues with the surrounding area? (Remember: don't give anything away to future letterboxers!)