Partners AirTag not notifying that’s it’s following me

Hello! I am a truck driver with my partner and he has two AirTags, one on his keys and the other on his wallet. He asked me what I do about the notifications regarding his AirTag following me and I realized, I haven’t. His belongings follow me through multiple states but I have never been notified about an AirTag tracking me. Should I be concerned about this? What could be the reason it doesn’t notify me? He doesn’t share the location of the AirTags with me.