I bet he opened it because he was curious.
I disagree about UPS coming back immediately if you called them and mentioned a gun. In this day and age UPS would not come back, but they would ask the local swat team to go over there.
This kind of curiosity is just dumb.. Surely this knucklehead knew the package was mis-delivered. He stated that there were two labels on the box... The correct one with the gun dealer's address and the label that fell off his TV.
I've called UPS about mis-deliveries. They send the nearest truck within about an hour. How would you know it's a firearm without opening the box? If the guy was minding his own business, he would not know the contents. No doubt he saw the gun dealer's address and decided to be a schmuck. Or more accurately, he was already a schmuck and he wanted to be a hero... Now all of his left leaning friends will buy him a Corona and he can bask in their admiration for being a force for the "cause".