We’re sorry, but this is a serial number for a product that has been replaced. Please check your information and re-enter your serial number. If your information is correct, you may need to contact us.

If it says the serial number was replaced that likely 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.

Fake copies can have real serial numbers that will, of course, be reported as valid. If you take them to Apple they can tell the difference. The only real way to be sure Airpods are not fake is to only buy them from an Apple Authorized retailer. --> https://locate.apple.com/