They do and boxes can and do get caught in sorting machines as well. I shipped 2 convertible latches to FL well packed in a small flat rate box with the box tapped all the way around on all sides and still only 1 latch showed up. I put a trace on it and no one remembers the box getting ripped open except the receiving post office. Hmmmm must have happened before we got it. The OP was lucky that the shocks even stayed in the box!