Cash buyers....a difference?

[Rodney Dixon]

My recent endeavor of finding a real estate agent to work with to accomplish a couple of things(in which in total entails deriving data from the MLS,) has led me into contact with someone who is not an agent but has informed me that cash buyers obtained from MLS data are not including in the data from deals that were closed privately in real estate attorney offices. I'm wondering is this true? If so, how could data on those private cash only deals be obtained so that a list of cash buyers could be compiled?