Sure, if DCasey used or relied upon info he ONLY knew/received while working for JBaez - then it's privileged.
Problem is that it's real clear, what with the timing of DCasey's being hired by the Anthonys and THEN saying we're going to go get her, etc., to me that whatever he was being told, he was hearing it then, in Nov., and not previously while employed by JBaez. And you can bet that the ANthonys, who were paying DCasey, knew all about this, too, so there's no privilege between Casey--> parents--> DCasey, and it doesn't matter if JBaez also knew at the time Casey's parents told DCasey.
But I'll bet you JBaez screwed up the privilege issues in his own mind. :doh: