How to check either my AirPods are genuine or not?

Click on this link to discover how to find the serial number --> https://support.apple.com/HT209371

Enter the serial number in this link --> Check Your Service and Support Coverage - Apple Support - https://checkcoverage.apple.com/

Does it find them? If yes then at least the serial number is real, but I guess a good fake pair would use a real serial number. The only real way to tell is to only buy them from an Apple authorized retailer. --> https://locate.apple.com/

If it says the serial number was replaced that means they were reported as defective and Apple replaced them but they were not returned to Apple as required, or they were reported lost or stolen from stock or during shipping. No support or service is available for them.