We have some label makers in CCL that can be used to label outlets with the corresponding breaker number. Or just use a Sharpie to write it right on the outlet cover. I believe all the outlets in CCL are labeled.
At some point we also had one of those gadgets that you can plug into an outlet and it inserts an audio (radio?) signal that you can detect with a handheld receiver at the breaker panel. Might still be in the red tool cabinet in CCL - no idea where it would be if it's not there. Omni tool room perhaps?
Patrik