I did some research last night on car theft with keyless entry and keyless start/stop on vehicles. If you leave your key fobs laying out on your kitchen counter like I do, a car thief can use a transmitter to catch the signal of the key fob to clone it and just drive off with your vehicle. I guess one of these bags that can block the signals would be a good start. I'm just posting a link to the first one that popped up, I'm sure there're better ones, but you get the idea.
Faraday Bag for Key Fob (2 Pack), TICONN Faraday Cage Protector - Car RFID Signal Blocking, Anti-Theft Pouch, Anti-Hacking Case Blocker (Carbon Fiber Texture)
https://www.amazon.com/dp/B07MDF5TX9/ref=cm_sw_r_cp_apa_i_o3ZjEbAWH44RH