This cache series was originally developed by Maryland cacher MDSurveyor with the cache P.O. Box – Bel Air. I learned of it when fastflyer imported the concept to the Conejo Valley with his cache P.O. Box - Thousand Oaks and with his kind permission, I am continuing the concept to include more locations where I cache.
- Start at the Seal Beach Post Office.
- Solve the puzzle and determine the cache location.
- You can see that not all the digits of the coordinates in the clues are consecutive but you'll figure it out.
- From here it should be park and grab.
- The cache is a white vitamin bottle, not on the ground or in the bushes.
A simple puzzle, once you learn how to apply this set of three numbers for the cache: (Grid:Row:Column).
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 2 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 you get the Row number before the Column number).
The final cache location is:
N 33° ab.cde W 118° vw.xyz
To determine the cache location, use the (Grid:Row:Column) format to find the letter values:
(G2231:R8:C4) = 2vw8
(G2591:R1:C13) = 2xyz
(G3711:R7:C6) = 3cde
(G4211:R5:C11) = 40ab
The P.O. Box lobby is open 24 hours a day, 7 days a week. Stay safe, have fun, and good luck!
*****Congratulations to Six of Clubs for FTF 
*****
Happy Caching! A cache a day keeps the doctor away
Feedback is always appreciated on the difficulty/terrain ratings, cache descriptions, etc - thanks.