How to verify AirPods authenticity using serial number?
How to find AirPod serial is original
[Re-Titled by Moderator]
You can verify it via Check Your Service and Support Coverage - Apple Support
But you can not guarantee it is real via serial numbers. The fake ones also have the serial numbers. Avoid to order it from 3rd party store. Just order it from official Apple store.
Refer to this arctile to recognize real or fake AirPods Pro.
How to Recognize Real and Fake AirPods Pro 2nd Generation? - Audio Spare