http://i.imgur.com/FLOp2Ma.jpg
Check this out.
Some smart individual noticed the reflection of light in what appears to be two eyes behind the boy. Probably of a dog or some other animal.
I hope the link I provided worked, one I found on a discussion of this photo on Reddit. Either way, look at the two whitish dots behind the boy.
Edit. It does work. Is that a dog?
What is that??
One photo was on an Amtrak train somewhere, and seems to have been ruled out as a prank.
The other was found on or near a construction site in Southern California, and was deemed more likely to be authentic, in other words an image of the same girl as seen in the Florida photo.
I can't remember where I read these details, and the info was scant, unfortunately.
I have searched the Web, but I haven't found these pictures, and it seems that they were never released publicly, or at least posted online.
The first was found near a residential construction site in Montecito, California. The haunting Polaroid, taken on film not available until June 1989, shows the blurry image of a girl's face, her mouth again covered with tape, her hairline exhibiting that same cowlick at the right temple. Behind her is light-blue striped fabric similar to that on the pillow in the Toyota van photo. Another Polaroid, this one taken on film not available until February 1990, shows a woman loosely bound in gauze, her eyes covered with more gauze and large black-framed glasses. A man is sitting next to her on a passenger seat of an Amtrak train.