Three code could be found in the #EXO5 DAY 1: ANOMALY FOOTPRINTS AND PHASE MAPS post on the Investigate Ingress blog.

[1] qicgzna5femr27g5

[2] 0psn9avq1c5h

[3] 51153533425115133433434442451344324215135314

Code #1

Observations

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

Code #2

Observations

An old roman emperor will guide you

Code #3

Observations

All numbers, why that range