I lost my AirPods and I couldn't find it because it is offline

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.

See this for more detail:

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

Good luck.