4x4 Post Capper v2 - Geocache Hide

I wanted to add a Geocache to an area that wasn't robust with good hiding spots.  I noticed a small 4x4 post driven into the ground to mount an electrical box to and realized I could design a cap to go on top, that would look decorative but also have a void large enough for a micro sized Geocache. 

This is version 2.0 of my design.  The original had a taller point on top but I opted to save some plastic and make more squat and sturdy design.