Hi kfrogluvr,
Thanks for using Apple Support Communities. We understand you have some questions about an alert for an AirTag. We're happy to help look into this with you. To start, see what to do when you get an alert that an AirTag is with you here:
1. If you have an iPhone, iPad, or iPod touch, Find My will send a notification to your Apple device. This feature is available on iOS or iPadOS 14.5 or later. To receive alerts, make sure that you:
Go to Settings > Privacy > Location Services, and turn Location Services on.
Go to Settings > Privacy > Location Services > System Services. Turn Find My iPhone on.
Go to Settings > Privacy > Location Services > System Services. Turn Significant Locations on to be notified when you arrive at a significant location, such as your home.
Go to Settings > Bluetooth, and turn Bluetooth on.
Go to the Find My app, tap the Me tab, and turn Tracking Notifications on.
Turn off airplane mode. If your device is in airplane mode, you won't receive tracking notifications.
2. If you don't have an iPhone, iPad, or iPod touch, an AirTag that isn't with its owner for a period of time will emit a sound when it's moved. This type of notification isn't supported with AirPods.
If you detect an unknown AirTag, Find My network accessory, or AirPods, use the steps below to learn about it, find it, and disable it. If you're using an Android device, you can download the Tracker Detect appto find an AirTag or Find My network accessory that's separated from its owner and might be traveling with you.
You can see more about that here: What to do if you get an alert that an AirTag, Find My network accessory, or set of AirPods is with you - Apple Support
Thanks.