....
Continental Airlines, PDX-HOU-GPT. Got home and discovered my "Pub Bag"
was missing from one of the checked bags.

Family flew to Paris over spring break -- was KLBB to IAH (Houston, Bush
Internatioal) on Continental Airlines and Air France to Paris, Return trip
on Sat was the reverse using Continental to Lubbock from Houston.
Ended up that some gifts purchased for friends were missing from checked
baggage on arrival in Lubbock.
I have some doubt that bags can be locked -- at least on international
flights.
Our bags had inspection certificates inside when we opened them.
Gaylon