O/T (sort of)
In the early 1980s in Greenwood, SC, an 8 year old girl, Kia Logan, was kidnapped while riding her bike in her apartment complex. A massive search went on and on for her. At one point, bones were found not too far from Kia's home. I worked in the local ER and was present when a deputy pulled into our ambulance bay with these bones in the trunk of the car and our on duty pathologist went to the car and immediately identified them as animal bones without hesitation. I was there and it took about a minute. No need to send them off, test, etc.
About a year later, a hunter in Newberry, SC, about 30 miles from Kia's home found a skull in the woods and some small bones. There was just enough change in the skull/teeth to make a firm identification that it was Kia. This skull sat in storage for about 20 years until it was sent to Quantico, VA for forensic testing and DNA. It was finally confirmed that it was Kia. No big publicity and no one was ever charged. (Whenever I read Iris Johnasen's book series about Eve the forensic sculptor, I think if someone had been able to do that 20 years ago, little Kia would have been identified years ago.)
Sadly, my points are a good pathologist knows animal bones versus human bones, no one ever thought of looking for Kia where she was found and Caylee may be somewhere where no one would ever consider looking. Cocoamom's theory sure is a great one and I think someone thinking outside the box will find Caylee versus LE who seems pretty closed minded, lately. And whomever finds her will likely just happen on something unexpectedly.
Back to lurking, now....