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Yep, usually a little bag that’s lined with a metallic fabric or thin metal with a top that folds over a couple of times and is fastened with Velcro. As described, it blocks cell signals so would keep his devices from being tracked regardless of power status.A Faraday bag. I’ve considered purchasing one to put all of our car keys in after a rash of thefts in my neighborhood. A friend bought one by accident (she thought it was just a cute small purse), and could not understand why she was not receiving phone calls and texts.
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Faraday cage - Wikipedia
en.wikipedia.org
We use them all the time at work; I personally own one of these:

Mission Darkness™ Non-Window Faraday Bag for Phones
Keep Cell Phones and Small Devices Shielded The Mission Darkness™ Non-window Faraday Bag for Phones completely blocks all wireless signals and keeps small electronic devices shielded to prevent hacking, tracking, spying, and chain of custody corruption. When a cell phone is properly...

For those curious about the actual products. Most look pretty much like that.
JMO