Where to find the last known location of an airpod?

Hello,

If your AirPods are out of Bluetooth range, out of charge, or in the case with the cover closed, Find My won't give a current location. You just have to find them manually by looking for them. However, Find My may list the most recent location where they were last connected. Note: with the latest versions of iOS other Apple devices can sometimes help to locate missing devices.

See this for more detail:

How to find your lost AirPods, AirPods Pro, or AirPods Max

Good luck.