The case is called a reverse geocache and it can only open when it's in a certain spot in the world. It was made with a metal box, IKEA door handles, nixietubes to display distance, a GPS sensor and an Arduino.
It looks like a pretty complicated project (the paint and IKEA door handles as bars do a good job to add to that), but I love the idea of reverse geocaching. It's like the perfect gift box. [Arduino via MAKE]