If I had treasure that needed to be buried I would dig a really really deep hole, put my treasure chest in it, cover it up with a few feet of dirt and put another treasure chest with only a few items in it, on top of that dirt and then finish burying it. That way, if someone stole my map they wouldn't get my treasure, because who would continue to dig after they found a chest with a few riches in it? And let's be serious, I wouldn't need a map.
