Should I be worried about this package left in my car?

Maybe it's nothing, but it's possible that it's to distract you or to make the door not close properly when you put the lock on and then steal your car. Be very careful. If you notice anything strange with the car, like a flat tire, something on the windshield or on the door, get out of there quickly or go back to your apartment. I recommend calling the police station or stopping by and letting them know. Maybe they have more information about it. I'm not trying to scare you, but try to be aware of everything. Even some cars parked that you don't recognize or that are on.

Yes, call the police, honey