Cache is not at posted coordinates. Use the numbers provided in each waypoint of the Adventure Lab to calculate the coordinates for the final waypoint.
N34 E.CA
W118 17.DB
This is a nice and easy find after completing the Exposition Park Adventure Lab. If you started the lab at the Olympic Swim Stadium, and followed counter-clockwise, then you likely ended it knowing the coordinates were only a brief jaunt away.
Please check out my Exposition Park Exploration Adventure Lab.