A tracking device can securely communicate with a secondary device. The secondary device can provide locations associated with the tracking device to a tracking system. When the secondary device determines that the tracking device is lost (for instance, in response to no longer receiving communications from the tracking device), the secondary device can provide additional locations associated with the secondary device to the tracking system. The tracking system can store locations received before and after the tracking device was lost, and can provide these locations to the user for display within a map interface, enabling a user to digitally retrace the user's steps in order to aid the user in locating the lost tracking device.