[DavidI]

Here is some info to locate them if they are attached to your car:

Listen for beeping

If an AirTag is separated from its owner for more than 8–24 hours, it will start beeping.
Search your car.
Check all areas of your car, including under seats, in compartments, and the trunk.

Use an iPhone
If you have an iPhone and are near your AirTag, you can use the Find My app to locate it:
Open the Find My app
Tap Items at the bottom of the screen
Tap the nearby AirTag
Tap Find
Follow the onscreen instructions to move closer to the AirTag

Use an Android device
If you have an Android device, you can download the Tracker Detect app from the Google Play Store:
Open the Tracker Detect app
Tap the Items tab at the bottom of your screen
If the AirTag is within range, it will appear as a blip on your digital map
If the app detects an AirTag for at least 10 minutes, you can play a sound to help find it
You can also receive notifications on your iPhone if an unknown AirTag is moving with you. To enable this feature, you need to have location services and Bluetooth turned on in your settings, and tracking notifications turned on in your notifications.

Also, if someone does not want the Airtag to emit the beep, the disk can be split in half (think of an Oreo cookie) and the speaker can be removed to eliminate it.