Stolen Airpods

Your answer is at the end of the article I shared:

Replace a missing AirPod or case

If you still can't find your AirPod or Charging Case, or if something is damaged, get the serial number and then contact Apple Support for a replacement. Then learn how to set up your replacement.

You can also learn more about AirPod pricing and service options.

Please read this article:

If your AirPods are lost - Apple Support

If you have lost your airpods due to your own fault, then apple does not ensure that they will get replaced. However, to locate them, you could use the FindMy app, hope this helps