To help find the circuit breaker that should be powering you outlets should be pretty easy. Because it is simple and reliable, use a non contact probe. Place it near a 120 volt wire and then trip breakers until the probe quits buzzing and flashing. Write down the CB number and what it powers. Continue until ALL the CBs have been tested. I suggest ALL because then you will know what each one powers.
One should power the outlets and that will be the one that didn't turn anything off.
Now you know the CB for the outlets, the real trouble shooting begins.
I have 8 CBs, 4 are for outlets and are 15 amp. This is normal, probably 80 or 90 percent of outlet CBs are 15 amp. That should help narrow down what you need to test to find the circuit your looking for.
Good luck and have fun.