That is exactly why I try to get framed items unframed and shipped in a mailing tube by the seller. And, when I ship large flat items, I roll them in a tube.
I had a similar experience once, although my damaged item (a police gazette cover) was not nearly as cool as yours was, and I hope to never have it happen to me again.
When shipping glass in frames, it helps to cover the glass with tape.
Very sad,
Doug
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