I do not know if it has been discussed yet but I believe that we should secure every package we send through the mail system with tamper-proof verifiable seals.
Watch:
https://www.youtube.com/watch?v=o7hfF8EQ1CgPhysical coins, laptops, watches, electronics, they are not safe from the government intercepting them and bugging them or destroying them.
Prevent this from happening to you or your customers.