Three codes were hidden in the HTML source of the LIVE AT TRANSGRESS post on the Investigate Ingress blog.

[1] ca2uu8cr47aj2sf

[2] sq4wp3ra9k62my

[3] ssp31tl275tl

Code #1

Observations

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

Code #2

Observations

Again, 14 characters with the right ingredients

Code #3

Observations

Passcode format is there, go through your usual cipher routine