Faraday Box for Car Keys, RFID Blocking Box, Anti-Theft Keyless Fob Protector, A

This box is approved for its superior security. These anti-theft devices are police approved to ensure your car keys are safe. The lock adds an extra layer of security. That said, it’s not just a car key signal blocker box: there’s also space for wallets and standard-sized iPhones (Plus/Max models will not fit).

eBay