Akasazh, 11 months ago 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: en.m.wikipedia.org/wiki/Letterlocking arstechnica.com/…/locked-for-300-years-virtual-un…
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:
en.m.wikipedia.org/wiki/Letterlocking
arstechnica.com/…/locked-for-300-years-virtual-un…