Could It REALLY BE A Friday 13th Prank??

I've been following tids and bits of the Amber Dubois case, and remember hearing on Nancy Grace this week that it was suspected that Amber's dissapearance on the 13th of Febuary could be a prank of some sort by fellow classmates.. Nancy threw that theory out the window saying it was unsubstantialized and stupid, and I did at first, but then I read this:

New Lead In Missing Amber Dubois Case

Escondido police are looking into new tip Saturday evening. Tipster said Amber was seen walking with a tall boy on the day she went missing.
"They are thinking it was a high school student. They want to make sure. They want to talk to him and no one has come forward yet," Amber's mother said. (source)
Three teens reported in area were offered a ride home from school by a man in a small white compact vehicle, said Lt. Bob Benton.
In all three cases, the man approached the teen girls just after 3 p.m., he said
Benton said "it is too early to know if these incidents are connected to the disappearance the Amber Dubois".
One girl was in the 1400 block of Oakhill Street, and another was at Boyle and Rose Street, he said. The third location was unavailable.
When the girls declined a ride, the man drove off, Benton said.
The may be a Honda or Toyota, he said. The partial license plate is"5W00" or "5WWM," Benton said.
The man was described as a white man in his early 20s, with eye glasses and short dark hair, Benton said (source)