What must you file at the time of entry if your manifest quantity does not match the actual quantity?

When the manifest quantity does not align with the actual quantity during the entry process, it is crucial to file a customs form 5931. This form specifically addresses discrepancies between the quantities reported in the manifest and those found upon inspection or verification. Filing this form serves to formally document the differences and ensure compliance with customs regulations. It is an important step to maintain transparency with customs authorities and avoid potential penalties for misreporting.

While other options might pertain to different customs procedures, they do not directly address the situation of quantity discrepancies in the manner that customs form 5931 does. For instance, a revised manifest would imply a change to the original documentation but does not serve as a formal declaration of discrepancies. Thus, the requirement to file the customs form 5931 is the appropriate action when quantities reported do not match the actual amounts encountered.