Once again I'll repeat: Take a few minutes and make labels for all of your fly boxes that have your name and phone number on them. Attached with clear packing tape they will last for years. This is your best defense against a permanently lost box. One of two things will happen if your fly box is found: Someone will call you and offer to return it. Or they will rip off the label and keep the box.
Do the math on the odds and you will find that having labels attached is a damned good idea.