This is an easy 2 part Multicache, and Not at the posted coordinates, because, Why Not?
At WP1 the Posted Coords
find the big box, it has a yellow decal, with an 8 digit number
ADD 156 to the First 3 digits, Total = A
ADD 322 to the Last 3 digits, Total = B
Final location
N33 50.A W118 18.B
Checksum of A+B =21
Have Fun!!!