Three codes were hidden in the HTML source of the HUMINT IMG 6902 post on the Investigate Ingress blog.

[1] mladlafhfajjjhbplfjhlakabojhfzffbkvv

[2] 7adr24oveisc26dvqo

[3] qmk37xldziwrxv335it

Code #1

Observations

All letters, maybe the range is not obvious but applying a simple cipher makes appear

Code #2

Observations

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

Code #3

Observations

Passcode format is there, go through your usual cipher routine