Many companies will open a sealed box to make repairs to unsold units. This is necessary when an engineering change is made to the assembly line, they will try to catch all units in the pipeline and update them. This is better than having to recall units from customers or accept returns to fix a known problem.

The company I work for has intercepted shipments from our factory and reworked them with known engineering changes before repacking them and shipping them to customers. As long as the box is re-sealed while on company location in original condition (use a new box with new packing material if necessary) this is NOT fraud and the customer is NOT being victimized. (If Ford just started using new brakes on all cars made after a certain date because the current ones didn't work all the time wouldn't you want the factory to change out the ones on the car you just bought, but hadn't taken delivery on?)