Such as?
The average person who doesn't know MB or any of the case players or local LE would not have a way to confirm what was posted if the information was not available elsewhere. Most of what I read isn't something I read or heard before. Details of the marriage, dating, alibi info, vehicle mileage, etc.
Maybe LE does know, but it wasn't released... People have ways of finding out information and it very possible some of these things are coming to the surface...