Three codes could be found in the A SHOW OF FORCE post on the Investigate Ingress blog.
[1] 4urd8xnmaeg3x9u
[2] 4q2qluuaides9rrj6e
[3] %!#!$!)^!&!$!!&)#(@@%@$
Code #1
Observations
Passcode format is there, go through your usual cipher routine
Code #2
Observations
18 characters with the right amount of numbers for a valid passcode
Code #3
Observations
All symbols, usual method for these does apply but not on all of them