Lee's a strange one. I was surprised when he told how baby plans went on b/t CA & ICA around him, decorating the room, shower plans, and he was completely excluded. No doubt he's got plenty of emotional baggage too, from that alone, but he was well-trained not to ask about the preg. a second time. I'm sure Lee's been left out of quite a lot in that house. I don't think he holds any "key", that might lock her away forever. If he did, though, he would no doubt keep it to himself. Personally I think he wanted to be the one to "save the day", so to speak, i.e. get info from ICA that would bring Caylee back, find Caylee, etc... That would forever ensure his place in his mother's heart. The ultimate knight in shining armor.
What did he take to the DT the other day? I'm really not sure that he took anything. Do we have Lee saying that he did? Who knows he might have just wanted to tell JB off, or whatever.