What happens if I lost my AirPods case?
I lost my AirPods case and it is still under one year warranty, am i able to replace it?
Warranty does not cover loss or theft but you can replace it for a fee. See the following from If your AirPods are lost - Apple Support
If you still can't find your AirPod or Charging Case, or if something is damaged, 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.