[I Buried My Guns]

"Oldness" is not an important characteristic. They are all the same in this regard, as it is the little metal wire mesh that keeps the microwaves IN that also have the effect of keeping the EMP OUT.

You know the wire mesh that is visible inside the glass on the door? That is the Farady aspect. That wire mesh encompasses the entire device and is what makes them a tool against EMP.

I used the word "old" simply because folks rarely offer new ones on Craigslist. It does not need to be a working device, as the thing that makes it valuable to us is the wire mesh.

On the other hand, you can buy the mesh separately. It is expensive, though.

[netmilsmom]

So if my 1997 microwave gives out, I can use that?

Or I can put the radio in the microwave in the camper?

[Nathan Zachary]

LoL! That “mesh” is plastic on most microwaves these days. It doesn’t keep nothing “in”. The “microwave” produced by the microwave oven only covers a tiny area within the cooking area. On real cheap ones it doesn’t even cover the cooking area, which is why they have a rotating table so things cook more evenly.

[TalonDJ]

On the other hand, you can buy the mesh separately
Or just store stuff in ammo cans. Or PC computer cases for that matter. Those are also Faraday cages because they throw out so much RF that needs to be contained. As someone said metal trash cans would be cheaper and do the same job.