AirTag low battery notification in 'Find My' app

Device moving with me notification in “find my” app as well as the one AirTag I have that is titled my keys which was showing a low battery at the time. The notifications have stopped as well as disappeared after I changed the battery.

My question is could it have been the same AirTag just showing me that notification bc the battery was low? Or is there another device that someone could have planted in my car being picked up?

[Re-Titled by Moderator]