Three codes were hidden in the HTML source of the WHERE THERE NEVER WAS A HAT post on the Investigate Ingress blog.

[1] ulfiplygdlxlexlnjurevumrmve

[2] uczfuldkhbdqkcyhxhsiwrsiwg

[3] 4muj3d6zadoz9vef

Code #1

Observations

All letters, go through your usual cipher routine

Code #2

Observations

Hadn’t seen this in a while, probably the reason why the code stayed live over an hour. Not fair :p

Code #3

Observations

16 characters with the right amount of numbers for a valid passcode. You’ll need to shift things around