I think this was a family on summer vacation and the kids were in back of van all set up for road trip and they all thought it would be funny to stage something like this.. maybe it was going to be an inside joke for family members and the picture fell out of van! Family gets home and sees their photos all over the news and they're like uhoh we are in trouble! 20 years later send photos to police station as a joke amongst each other
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Could have really been anything from a family on vacation to just a group of kids messing around in their basement with a camera. Again we know virtually nothing about the history of the photo and everything is only assumed as there was no one to back up anybodies story. For all we know the whole thing about it being found in a parking lot where a white van was parked could have been entirely made up as we know absolutely nothing about the person that supposedly found the pic (she just disappeared after the photo was found and now is just as big of a ghost as the two kids in the pic are).
As far as the 2009 pic I don't think there is any evidence to suggest that the person in that pic is the same individual as the one in the '89 photo.