Doesn't matter if its a box of feathers, don't throw it.
Update, the driver got fired.. but wouldn't it be something if there was someone catching and stacking them, his timed throws suggest that someone might be catching them, eitherway not a good look.
BTW, our daily ground pickup(at our express station) the driver varies but the actions are the same, they all throw the packages in their P1000, wonder if I should film it.. I did once ask the guy not to throw packages,("if you could not throw packages, that'd be great mmkay") but he came after me like he wanted to fight, luckily our office is secured and they aren't allowed in(he kept asking for me)