I'm puzzled where the flaw is in this trap.  It's all metal, so it certainly removes the mouse's ability to chew their way out.  Yet I'm having the same mystery as so many others here:  mice get in, they eat the bait leaving a mess inside.  The get out however.  I've looked it over, applied tape to the cover to prevent a strong mouse from pushing his way up and out.  The tape doesn't not prevent escape.  So the lid must not be the flaw.