Just a little point which ties in with this post and is as follows.
90% or more do NOT give a Honest answer to the other question which goes with did you pack it yourself, in the question "has your luggage been with you at all times and not left your sight".
Most luggage as either been in the boot (trunk for you from across the pond) of a car or maybe in the luggage area of a coach.
So unless you have travelled by train or tube to the airport you have all told a little fib, l have always thought that this was a dam stupid question to ask.