Three codes were hidden in the HTML source of the Signals Inbound post on the Investigate Ingress blog.
[1] dev51yofv182hs
[2] 999897c7c6919e989e8c8c9ec6c8cb998a
[3] b5i4sas8nrtj2t8u
Code #1
Observations
Passcode format is there, go through your usual cipher routine.
Solution
Code #2
Observations
Look like hex but out of normal range
Solution
Code #3
Observations
16 characters with the right amount of letters for a valid passcode.
Solution