What to do if you get an alert that an AirTag, Find My network accessory, or set of AirPods is with you - Apple Support
By A Mystery Man Writer
Mark a device as lost in Find My on iPad - Apple Support (RS)
How to locate an unknown AirTag moving with you on iPhone
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Set up and use Notify When Left Behind in the Find My app - Apple Support
What to do if you get an alert that an AirTag, Find My network accessory, or set of AirPods is with you - Apple Support
What Is the Unknown Accessory Detected Message on an iPhone?
AirTag – Wikipedia
What Is 'Unknown Accessory Detected' Alert on iPhone- The Mac Observer