I've had a few boxes shredded over the years, none high end collectibles fortunately, but it happens sometimes and by every one of the carriers at some point. I even had an envelope with some collectible cards in it torn completely in half by the typically great Royal Mail once- impressively though they did manage to get the surviving half all the way to Arizona. Sideshow will probably help you out with a box that badly damaged. You can always do the pack out option if you are really concerned, it costs more but the reality is that it costs more to ship a larger package even if it doesn't weight a lot more, I run into that a lot when I sell things. I'm kinda glad they have it as an option and not as default honestly, I've probably saved a figures worth of money by not doing it.