I understand your reasoning here. Truthfully if I was in your shoes I would likely think the same.The most likely reason ( and I know you will disagree ) is they are your tires and the inspection missed them, who steals tires and replaces them with the same date code????
As I noted though, the fronts are still 50-60%. They were rotated at 10,000 miles. So the fronts have gone 10K on the back and 7K on the front.
Plus I have a perfect rim again.