Our paperwork says all luggage must be locked. Airlines say 'don't lock'. Do we need to buy locks and put them on before we get to the cruise terminal? Will cable ties work?

I have been on 7 cruises through 5 or 6 different airports and have never locked my luggage, just do not put anything of real value in them, carry your camera, video cam., jewelry with you. for that fact I would not even take good jewelry on a cruise no need for it!!

Go to any luggagestore or Wall-Mart and pick up a "Sentry Lock" They are designed so that the scanners can open your luggage if needed with a special key that only opens this type of lock.
It says right on the package,You Can Now Lock Your Luggage Again. As f

I take my good jewelry for formal nights and just keep it locked in the safe in your room. Some airports such as the small one I fly out of hand check the checked luggage. Once it is ok'd then you can put a lock on it. But if along the way it goes through another scanner somewhere and something is suspicious they could break the lock. So you might want the special lock like Oreo mentions. I personally haven't locked my luggage in a long time. I just hand carry any valuables.