Three codes were hidden in the HTML source of the CHICAGO RPE REPORT 1 post on the Investigate Ingress blog.

[1] ie5e5842mdvjnepfd

[2] au3zergudkilstael

[3] ewmtjq848433574aw

Code #1, #2, #3

Observations

All three codes have the same length and the total amount of number is 15, all you need for 3 valid passcodes