Amazon.com: GPS Tracker, No Monthly Fee IP68 Waterproof Hidden Bike GPS Tracker Case, Work with Apple Find My(iOS Only), Reflective Bike Taillight Anti-Theft GPS Tracker Holder for Bike, Electric Bicycle, Scooter :
Amazon.com: PerfiPro Airtag Bike Mount, Hidden Bike GPS Tracker Case for Apple Airtag, Airtag Bike Seatpost Reflector Mounts, Anti-Theft Airtag Holder for Bike, Electric Bicycle, Scooter : Electronics
Hidden inside the bar, Sherlock wants to bring stolen bikes home - Bikerumor