Three codes were found on the HTML source of the ARCHETYPE SURVEY RESULTS post on the Investigate Ingress blog.
[1] po55wzeut995ne
[2] 2u2y5crvyeeuj2d4
[3] cu4xzzqzbzzb9lyzbloxcxqbbxqzqzcxbblx
Code #1
Observations
Check the ends, you can see the keyword
Code #2
Observations
16 characters with the right amount of numbers for a valid passcode
Code #3
Observations
Your instinct will tell you what you should use but you might want to look at it the other way round first