Ask Apple. The package looks modern, neat and clean. The wrapping is meticulous. The messaging is clever, simple and easy to understand. The quality of the plastic and paper is better than most. And, the little extra protective coverings that fit each piece perfectly drive the point home...they want you to know they care.
Beyond the fact that the content works pretty darn well, the fact that it's hard for most of us to throw the box away means a lot.
Do your guests and customers want to keep the box?...box of turn down chocolates, gift card box, key packet, pen, etc?