Cache is at posted coordinates! Lock and Lock in old cache location. I had this idea a couple years ago but I'm just getting around to it now. One day at an event I was I was logging all these TB numbers and thought to myself "why am I doing this?"... well, he's something for ya'll that take the time to log them all.
To get credit for this cache you must have logged 500 trackables. Lock and lock used as old cache in same location that's at posted coordinates!