unplugging the microwave is NOT the way to make it a Faraday cage, because you just unplugged the GROUND…
All Faraday cages need to be GROUNDED because they just act like an antenna re-radiating the RF signal if they aren't…
and by the way. the best ground is a steel well casing, because they go deep into the ground…
a SERIOUS EMP will penetrate the ground BELOW the 10 ft grounding rods used by the power grid making them useless…