As for missing RTG's, it would not be at all surprising if they grew legs.<p>Maybe not the locals, but I would think most educated modern people, if they found the equipment, would have a large clue what was inside. There are not too many things you can put in a box on an isolated mountain top that would make it stay hot. It's not batteries, and it's not a engine.<p>In the late sixties, there were a dozen governments that would pay handsomely for such a box.