What do you use to insulate with, foam padding? And can you use any type of metal box?
You can use any king of metal box as long as it is completely sealed. I wrap in bubble wrap, then in cardboard and then put into the box. Then, in a metal filing cabinet. I’m overly cautious, what can I say. It’s unsure what would happen in an EMP anyway, buildings offer some protection. The more the better, I say.