One of these would be triggered even if you just nudge your box so they should be able to detect movement but they will not measure movement:
http://www.electrodragon.com/?product=vibration-switch-sensor-hdx-2
One of these would be triggered even if you just nudge your box so they should be able to detect movement but they will not measure movement:
http://www.electrodragon.com/?product=vibration-switch-sensor-hdx-2