Three codes were hidden in HTML source of the RPE IN BOULDER post on the Investigate Ingress blog.

[1] 9il64qcevq9ecoqvlttk

[2] yljwqow8tfou22l6

[3] 3bnivaiarbevawnt3wxig

Code #1

Observations

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

Code #2

Observations

Again, 16 characters with the right amount of numbers for a valid passcode

Code #3

Observations

A different kind of transpose but still a transpose