AirPod Pros fake?

I still think the AirPods are very doubtful, but it is impossible to be sure over internet. The only certain way to check is a visit to the Apple Store and get the pods examined in-hand by one of the Genius Bar techs.

I can think of several ways fakes could be introduced. One possible method would be genuine AirPods were probably swapped in a "purchase and return" scam which did not get noticed when the fake substitutes were returned for refund.

One thing is certain, Genuine Apple product will have a serial number on the box which matches the content. Th printed serial number on the box is usually the serial number of the charging case. The printed (on body) and electronic numbers for each component in the set should align correctly, and the serial number for each AirPod (Left/Right) will be different - but should match Apple's records for the set.

Find the serial number of your AirPods - Apple Support

Your only practical course of action to get a definitive judgement is to contact Apple Support and arrange to get the AirPods and their box inspected by Apple. If they are confirmed as counterfeit I hope you will be able to return to where you purchased them and get your money refunded.

The physical marked serial number printed on each ear pod should be different for each AirPod. Having the same number on each device, and mismatch between the electronic and printed numbers is a strong indication your "AirPods" are counterfeit and not a genuine Apple product.

If you have the opportunity to reject and return for refund I would use it, but I suspect the seller will have disappeared without trace. I'm sorry, I think you have been scammed.