If the lockbox does not respond to button presses or charging, you may perform a hardware reset. Find the reset button on the bottom of the lockbox next to the USB charging port. Using a pen, press and hold this button for 1 second. After the reset completes, press the Check-in button to turn on the device and restore the network connection. If the Check-in button LED turns red, verify that the device is sufficiently charged.
Note that a hardware reset is not a factory reset and will not prepare the lockbox for a new activation.