If you have a single outlet you are trying to determine, you can use a radio or alarm clock plugged into the outlet (take out the battery backup if using an alarm clock). Set the device to make noise, and flip breakers until the noise stops. (I have a small X10 module with an annunciator that I use for this purpose. I can hear it downstairs in the laundry where my panel is, even if the device is upstairs in a bedroom.)
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