We used the Luggage Valet when leaving the Navigator in February. We thought it was great. However, I never thought about any issues like Dave ran into. Now that I think of it, it would be so easy for someone to place drugs or something in the luggage when it is out of our sight. But I guess the same thing can happen when you put your luggage outside your door the night before.
Bottom line, we will probably use Luggage Valet when we cruise in December. Thanks to Dave we will know what is happening if alarms go off and the feds show up!