A person, yes. Hundreds of people with a 100% success rate? Now we're talking supernatural.
If the Predictor did an interview with people beforehand, and if they committed themself to picking box B without checking, and the Predictor was able to accurately predict which of those people were telling the truth (which is plausible) then I would do that, commit myself to box B and then take that without checking.
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timeasmymeasure
But I'd want to see his prior track record.
If the Predictor did an interview with people beforehand, and if they committed themself to picking box B without checking, and the Predictor was able to accurately predict which of those people were telling the truth (which is plausible) then I would do that, commit myself to box B and then take that without checking.