Three codes were hidden in the AGENT OLYMPIAD BEGINS… post on the Investigate Ingress blog.
[1] syt78cqzv632as
[2] 2544275454304528343123415358554321
[3] d5ope9h3in2fgcsr5n
Code #1
Observations
Passcode format is there, go through your usual cipher routine
Code #2
Observations
Spot the passcode format and check the range
Code #3
Observations
18 characters with the right amount of numbers for a valid passcode