Three codes were hidden in the QUINTESSENTIAL THOUGHTS post on the Investigate Ingress blog.
[1] rztpgbaeh386497w
[2] spairrge4is9nq8t
[3] ua6ey3v8ub2d86eb
Code #1, #2 & #3
Observations
3 codes with the same length and 15 numbers. All the right ingredients