Three codes were hidden in THE MIND PALACE RPE post on the Investigate Ingress blog.

[1] tioodwpfthbibclowot

[2] affomhlhxiirkflenpdeji

[3] agirsrtmnbgoixw.defnbtx

Code #1, #2 & #3

Observations

Well after playing around enough with the codes and not getting anything, the only thing left to do was to join them together