I never pack anything in checked luggage that I am worried about losing. That said, I still use cable ties to 'lock' the bag.
Last year on our trip to Utah our ties were in place. Coming home, flying on 9/11, one bag had been opened, but the TSA closed it with one of their cable ties and left a letter inside the bag. We pretty much just tossed stuff into the bag that was opened, so the contents of it were probably questionable when viewed in the scanner; the bag had some hiking boots, umbrellas and some other random items. Nothing was missing, and it didn't look like they messed up our "packing" job either!
Dawn