AirPods stolen
What do I do if my AirPods (1st or 2nd generation) was stolen and they aren’t in range or showing up on map?
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You'll have to wait until they are connected to a device again and show up.
Find your lost AirPods - Apple Support
Also report the theft to the local law enforcement and give them the serial number of your devices.
Check this article about it:
Find the serial number of your AirPods - Apple Support