The geocache is not hidden at the posted coordinates. This is a quick one stop then onto final location multi cache because the world needs more orange icons.
You are looking for a painted “shock box” (on the SE corner of Nelson and Airport) depicting lightning flashing across the sky. On the SOUTH side of the box you will find the dedication sticker for the box. Using A=1, B=2 C=3…
The final can be found at N40 09.AB W105 09.CD where
xxxxxxxAx xCxxxx
xxDxx xBxxxxx
xxxx