How long must a carrier generally retain a copy of hazardous materials shipping papers after the shipment is completed?

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1. Retention is required only if a shipment involved an incident during transport
2. For a required retention period, commonly measured in years, following completion of the shipment
3. Shipping papers may be discarded immediately once the shipment is delivered
4. Only the driver, never the carrier, is responsible for retaining shipping papers after delivery

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