Three were hidden in the REINVENTION post on the Investigate Ingress blog.
[1] 3v2chomvoco4n4c4
[2] s9phy7b6ai9spepn7p
[3] 97kgt47ybrcg974
Code #1
Observations
16 characters with the right amount of numbers for a valid passcode
Code #2
Observations
18 characters with the right amount of numbers for a valid passcode
Code #3
Observations
15 characters th3r3 are some 3xtra numbers