Why would AirPods disappear from list of devices on find my iPhone?

I've lost my AirPods in the past and used find my iPhone to find them, but I recently lost them and the AirPods aren't showing up on my list of devices at all. Could this mean someone else has them paired with their phone?

It could be that the battery in the airpods is dead or it could mean they are out of range. If some one found them, no doubt they could pair them up and might not show up on you iphone.

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