Looks like it got caught in one of the rollers, which if that was the case no piece of cardboard or anything short of steel would have protected it. I've worked around enough mail sorting facilities to see stuff like that happen from time to time. Anything caught in those gets instantly chewed up. A box is always a good way to go but I have seen those get flattened like a pancake too. Registered mail takes a lot longer and is handled completely separate from the general mail. Complete accountability along the way and a guarantee of arrival with insurance. It costs a pretty penny but if it's important that's how it should be sent.
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