The cache is NOT at the above coordinates , however you will need to start here
I got this idea for a cache while caching in Maryland last year (GC1BF0T). I wanted to bring the same idea home, so here it is.
The above coordinates are for the San Juan Capistrano Post Office. Inside, are PO Boxes with numbers that will give you the coordinates for the physical container. The PO boxes are available to visit 24/7. Note there is no physical container inside or at the post office. It's all virtual. The following is from one of the caches I found in Maryland (GC1BF0T). Read it as it will help you figure out the coordinates for the cache.
Grid:
When you enter the Post Office you will find multiple walls with post office boxes. A normal group of boxes is about 5 feet tall by 10 feet wide and a wall may have from one group of boxes to many groups of boxes. The Grid refers to ALL of the groups of boxes on any particular wall. Each wall of boxes is considered a separate Grid and there is only one Grid per wall. (Exception, if a wall has a door or opening that separates a set of boxes from another set of boxes then each one of those different sets of boxes would be a separate Grid.)
The Grid number is determined by the number of the P.O. Box in the upper right-hand corner of the Grid. Find the P.O. Box number that matches the Grid number and you are standing in front of the Grid you need to use.
A Grid has rows of boxes that run from left to right and columns that run from top to bottom. The P.O. Boxes at the bottom of the grid are usually bigger than the boxes at the top. The rows will normally lineup across the entire grid, but the columns will not. There will be more columns on the top of the Grid and less along the bottom of the Grid.
Row:
Starting at the upper left corner of the Grid and counting from top to bottom, the top Row is 1 the next Row down is 2 and continuing on to the bottom of the Grid.
Column:
Counting from left to right, the leftmost box is Column 1 and the next box from the left is Column 2 and continuing on to the right of the Grid. Warning, Row 1 will probably have more Columns than Row 9, so be sure to be counting across in the correct row (That is why I gave you the Row number before the Column number).
All that is left is to plug in the P.O. Box number that is at that particular spot on the Grid into the cache coordinates.
P.O. Box – San Juan Capistrano
To find the cache location, use the (Grid:Row:Column) format.
N 33° 29.([G771:R7:C45] add 6)
W 117° 39.([G951:R4:C14] minus 4)
You may use the solution checker below to make sure your coordinates are correct. The cache is a short walk away. Use stealth and bring your own pen.