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