I had a 5 or 6 year old knock on my door and deliver an Amazon package while mommy sat in the car on her phone! The kid looked terrified to be walking up to strangers houses. On top of that, he just hopped back in the car not strapped into a child seat or with a seat belt and she took off down the road!
At least the 6 year brought the package all the way to your door and knocked, sounds like my adult UPS guy could learn a couple a couple of things from him.