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A
Say nothing and hope no one notices
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B
Fix the error immediately and report what happened to your supervisor — acknowledging and correcting errors quickly minimizes impact and demonstrates integrity
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C
Blend the missorted mail with the correct mail
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D
Continue sorting and hope the error gets caught later
Why this is the answer
Correcting mistakes immediately and transparently is the only right response. The worst outcome is missorted mail reaching the wrong destinations — which is prevented by immediate correction. Reporting the error to your supervisor: documents the incident; allows them to verify the correction; and demonstrates the honesty and reliability USPS requires. Hiding errors leads to cascading problems.
Source: USPS 475 VEA, Error Correction and Integrity