Memory wise, there is a huge difference between the act of putting an object away in a specific spot in your home and burying something in the woods. How many hours do you spend in your home, and how many things do you touch, every single day. Now contrast that with how many times you've buried something in the woods. The difference is so great that comparing the two memories is like comparing apples and tennis rackets.
Not to give too much away, but for me all the speculation is moot because I have actually been in a position in my long and varied life to bury something in the woods in an adrenaline rush. Trust me, you remember where it is no problem, even if it's a forest you have never been to before. You remember markers along the way, your time sense might be a little off, but your spacial senses kick into overdrive because you are so worried about being caught that you become very observant. And yes, finding the spot again, even years later is not hard at all. It's trying to forget the spot that's hard, it's like not thinking of an elephant when someone says 'Don't think about an elephant!'
I bet MS is having a hard time not visualizing the spot every time he's asked about it, unless he's learned a memory trick or has taken a mild sedative before testifying. If he actually buried it, which I am believing less and less. The more he refuses to elaborate in any way the details of his story, the more it assures me it is a version that he and his lawyer cooked up that he cannot deviate from without showing its a big lie.