Three codes could be found in the DARK XM THREAT AND RESPONSE: DAY TWO APPROACHING post on the Investigate Ingress blog.
[1] 877f7ba9ac98899a889a877b8c7cabaaa9986f
[2] 2p9c2tcvjorve3y5
[3] chgarheterngbyqarrrvkrrwz
Code #1
Observations
Looks like hex but range is off
Code #2
Observations
16 characters with the right amount of numbers for a valid passcode
Code #3
Observations
Hail Caesar