Quoted from EricHadley:I would have peeked inside the hole and if no damage visible I would tell the driver I am opening for more inspection and if he’s good with that then i open and check for damage. If all good I keep it. I’ve had games with box holes from time to time and they are usually ok. Not always, but usually.
From the looks of the knife cut, I am quite sure the box was inspected for internal damage by a carrier station manager, and then put back into forwarding when no damage to the product was seen in the inspection hole. With NIB pinball machines becoming harder to find due to manufacturing problems, I would do the same visual inspection through the same cutout, and then simply note on the bill "possible damage", which establishes documentary evidence of an issue for future claim if needed.