Re: And again ....
I once knew someone who was of interest to the authorities.
When he sent letters he used to tape the envelopes, which often used to arrive still taped but with the hairs that were formerly under the tape now missing.
He sent one letter with one of those Christmas Sellotape designs, in the summer, with the message on the back "now find some of this." Of course it (a) never arrived and (b) was completely harmless.
As you say, there will be plenty of IT equivalents.