Car mechanic busts crooked mail carrier
Prepare an express envelope with security warnings etc. so that it looks
like something very valuable is inside.
Carefully fill it with Never-Seize and then seal it up so that none is visible
or leaks to the outside.
Send it to yourself from a fictitious address and see if you get it.
If anyone else opens it, they will be VERY sorry.
I also had political signage missing or destroyed from my front yard
at night. I coated the wire sign supports with Never Seize. I hope they
got it on their clothes, their car and in their house. Never happened
again!