A Microwave as a Faraday Cage!

I was going to build a Faraday Cage from copper rods and copper screen, soldered together.  I also thought it would look cool, but also kinda pricey!

As I explained the concept of a Faraday Cage to a Liberal Geezer (thinks prepping is just crazy)...he suggested just using a Microwave!  It keeps radiation in, it should keep EMP out! Totally logical and in addition, my new Microwave is metal and has a grounded plug!  Uh huh.

I "Googled" this idea and sure enough other preppers though of the same thing.  One problem...it doesn't work!  I tested it this morning.  My Microwave is a 1000W metal cabinet.  I turned on my iTouch4 to do a Wi-Fi Speed Test and put it inside (No I didn't power-up the Microwave!).  Unfortunately the Wi-Fi signal still got through....although, the signal was reduced by 50%.  I'm sure the EMP signal would also get through and "goodbye" electronic gizmo's & their chargers!

Plan B...I am going to get an enclosed tin box....insulate the inside and try that in the Microwave.  I'll put an addendum to this post on results!