Three codes were hidden in the HTML source of the DIALTONE post on the Investigate Ingress blog.

[1] 1bkb9iloetklg9n8o

[2] 5v4daset5mxz6n

[3] n;g5mhdqgwtvjcy

Code #1

Observations

Passcode format is there, go through your usual cipher routine

Code #2

Observations

14 characters with the right amount of numbers for a valid passcode

Code #3

Observations

This one is getting used more and more lately. That ; is a good hint on what you need to do