on the OTHER HAND it is not YOUR fault what OTHER people send to your address...
Perhaps the sender "got the address wrong" and it ended up with YOU.... also Call the damm post office and ASK them what that scene with the gloves and other vehicle is all about... ask an 800 number customer rep what that is- tell them it was going on across the street or whatever JUST to get the info you need... tell them it made you feel uncomfortable and you have a right to know- tell them "it scared the kids" whatever you need to do to find out what the heck was going on with that