A:Answer To correctly answer your question, yes it's possible to make these motion activated, however you will need to "get your hands dirty", and also void your warranty (unless you 'go the extra mile', or find a motion sensor with a USB output).
To get this to work, you would connect a motion sensor to a relay, and have the relay fire the lights, cutting the plug off in order to connect it to the relay. Going the extra mile would be integrating a USB port onto the output of the relay, at which point you should certainly be looking at putting it onto a circuit board.
An alternative method to solve your problem which would be much easier if you can get it to work on your safe door...
Utilise the door as a mechanical breaker switch for the power source (DC ONLY! DO NOT USE AC POWER!), which when closed leaves the circuit open (and the power disconnected), and when opened closes the circuit allowing the power to flow.
I hope this answers your question and helps you to find a solution.