Before departure for a flight, the load controller presents to you cargo documents for boxes containing spare parts. These boxes have a total mass of 4500 kg. If you accept all the boxes, given the following information, what will be the Underload/Overload?

Allowed Take-Off Mass: 76720 kg

Maximum Zero Fuel Mass: 62731 kg

Operating Mass: 58799 kg

Actual Zero Fuel Mass: 55063 kg

Actual Traffic Load (without the boxes): 12563 kg

Take-off fuel: 16299 kg

Disregard changes in fuel due to the increase in Total Mass.

Consider no restrictions on structural limits and Allowed Landing Mass.