it's just the postal workers.
they do it all the time. they read what's inside then if it's valuable, then they take it.
so whenever i send back stuff from japan(car parts, games, ect.), i always write down "used clothes, socks, old comics" ect...
don't ever write down games, new shoes/clothes, jewelry, or any new stuff that's valuable.
but in your case, i guess you can't do anything about it to stop it because you're not the one sending the mail.
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