I would not use zip ties to lock the luggage, just leave it open. I had zip ties on my stowed luggage and the tsa wanted to get inside, so instead of cutting the zip tie, they cut the zipper pull.
I use zip ties on all my checked bags. The difference is I NEVER pull them tight!! Leave a loop so that if they need to get in, they can easily cut it. Otherwise they may need to cut the zipper pull.