this post was submitted on 19 Jul 2023
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To add to other comments:
There are ways of folding envelopes or letter packages that are destructive in opening, so that tampering could be noticed.
The practice is called letter locking, here's some links:
https://en.m.wikipedia.org/wiki/Letterlocking
https://arstechnica.com/science/2021/03/locked-for-300-years-virtual-unfolding-has-now-revealed-this-letters-secrets/
I did that as a kid in school passing notes!