Three codes were hidden in the AN ANCIENT CIVILIZATION IN THE AMAZON post on the Investigate Ingress blog.
[1] uei35qdrhrs138gq
[2] up25czuvz784er
[3] fss62svzo622sb
Code #1
Observations
Passcode format is there, go through your usual cipher routine
Code #2
Observations
Flip them
Code #3
Observations
Passcode format is there, remember to apply the same method to the keyword