Real great idea RickP. I could also add a GPS sensor and give orders like "Jump in your car and exceed the speed limit on highway I-xx westbound for at least 30 seconds, near the bridge where cops normally hide" ;D
Maybe a safer way is to add a few tilt sensors and give an order to flip the box so that it would open just like pressing a few keys on the keypad in the right sequence, maybe safer this way :
By the way, I just registered on geocaching not long age and I'm waiting for snow to melt in a few months so I can go on a few advantures with my wife. I will definitely design a flip-2-open box once I get a hang of the geocaching.