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A
Issue a refund immediately to satisfy the customer
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B
Tell them nothing can be done because it was already delivered
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C
Explain the claim process — they must file a damage claim with USPS; provide them with the claim form or direct them to usps.com/help; ask them to keep all packaging materials and take photos
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D
Tell them to contact Amazon or wherever they ordered from
Why this is the answer
USPS has a specific claims process for damaged packages. The counter employee's role is to direct the customer to that process accurately. Key points: keep ALL original packaging (required for the claim inspection); photograph the damage; file within the claims window (typically 60 days for insured parcels). If the shipper declared value and paid for insurance, USPS is potentially liable. If no insurance was purchased, the claim options are more limited.
Source: USPS 477 VEA, Damage Claims