If you stop the video at marker 27 on the attached link - look to the right hand area of the screen. Appears it may be the two trees that are in all of the crime scene pictures where the remains were found.
http://www.wftv.com/video/18458335/index.html
Thanks for posting the video! It looks as if he was totally searching in the wrong place. Those cement blocks (if they're the ones we see in crime scene pics thread) were further out than the remains. It did look more like he was digging for show than because he was actually looking for anything though.