We are fortunate that most bad guys are real idiots. (Otherwise they would not be bad guys anyways). However I would not say this to their face, in case they become even more stubborn and dangerous.
The nearest attempt to what you've said was some guys tried to sneak explosives in toner packages sent to random overseas destinations. They were idiots. First they could not even seal the packages. But even more awesome was the fact that they expect random packages to go thru customs, and also believe people would be opening them. Again they are fortunately idiots.