Well, this is a fun question. People who are into geocaching get involved in this all the time--making and camoflaging caches, hiding the caches, finding the caches. I dunno, how many geocaches have you folks accidentally run across? Before my wife and I started looking, I never ran across one, even though there are hundreds of thousands of 'em hidden all over the world, some as big as 50 cal. ammo boxes. And almost none of them are buried. In fact, on my Garmin Colorado 300 GPS right now, I have 500 geocaches entered, and that's within 15 minutes by car of my house in SoCal. So, if you wanna hide something, and find it later, you might want to ask a geocacher.