>>510317492
https://eo-security.com/info-protect/faraday-safebox-signal-noise-blocking-box/

https://www.youtube.com/watch?v=zbGb_F1ahyA&t=39s

things like this exist as well to .gov etc for a very large price.
I prefer the do-it-yourself project because it was fun learning, much cheaper, and brought me peace of mind.
when the expensive solutions drop in price I will purchase one as well.