"In fact to really upset the entry people say oh well now I am here and the machine is open and you have seen it I will now change it!"
Wouldn't matter. The thought is that, now that it's open, they'll inject something into the device so that they can regain access to it at any time, even IF you change the code. Who knows? It may even be firmware-based and thus nuke-proof.
Biting the hand that feeds IT
