It wasn't the woman posting stuff that matters. Her husband is the one that sent a message to the administrator of the page telling her where he saw the van, where he chased it, where he lost it, why he lost it, and that he was able to read the tag. The tag number he provided in the original message was the correct one. The administrator simply copied and pasted the message she received.
His wife jumped on Facebook hours later, after both she and hubby had talked to police about the event. and she began giving details out as people asked about them. According to her, her husband continued to search the area where he lost sight of the van after the police interview. Just because she got the numbers of the van in reverse order doesn't mean much to me, maybe she was simply working from memory.
It was the most descriptive sighting we've had in the last 5 days, and it seemed and sounded pretty legitimate to me. LE appears to have dismissed it for whatever reason. I wouldn't be surprised a bit if they end up finding him right up there in those hills where the guy said he headed.