Three codes could be found hidden in the UNION post on the Investigate Ingress blog.

[1] z9yn2t6r9aqbo4r

[2] fkh52zxlobgv143lu

[3] 17768755156667964876276796986545559686

Code #1

Observations

15 characters with enough numbers for a valid passcode

Code #2

Observations

Passcode format is there, go through your usual cipher routine

Code #3

Observations

Try to spot the range, maybe look at it differently