A service that would tell one whether or not their packages are being profiled.
You go on your preferred market, place an order. The vendor ships some sort of inexpensive, hidden device that indicates whether or not the package was opened. Could be something triggered by light, by the lid opening, a recording device, etc. Any thoughts?
Couldn't you mail yourself this package? Some people put pieces of tape near the tops/bottoms of doors that will break open when opening to tell if someone opens it so you could try something along those lines.