Hello ㅋ274,
We see you're receiving an alert regarding an unknown item traveling with you. We can help provide info on that.
This page here helps to cover the type of alert you're receiving: View details about an unknown item in Find My on iPhone
The page will help to note "You can only view more details about an item and receive safety alerts if the item is registered to someone’s Apple ID."
See if you can try launching Find My manually for info. It can also help to try restarting the device, or force closing the app, and relaunch it.
Cheers.