well, maybe the last phone call was to a friend of JW's, and a message really was left, and this person called JW and told him where Lauren was and was planning to walk home. In Mickey Shunick's case, LE didn't exactly lie but
did erase Mickey from a video photo they released. If the mysterious phone call receiver admitted to the police that he called JW, maybe the police are
waiting for him slip up, or since they don't know where Lauren's body is, they
can't actually charge him. JR could actually be cooperating fully with police. As forementioned a few posts back, if Lauren was there, her fingerprints were probably on the Ipod and phone, and that's why JR was not arrested.
Maybe the mysterious last person called had a burner phone and so did JW.
JW would probably know right away to get rid of his phone, now he can deny getting the call. We have no real idea what kind of questions they asked these POIs. But curious that they mentioned the IPod incident, we think it is about her being messed up, but maybe it was inserted into the dialogue on purpose, the no message thing on purpose, because they know a message was left. I don't believe no message was left. As they are saying, there's lots we don't know behind the scenes, and they could have it that the mysterious guy called someone after receiving the late night call from Lauren/JR. Obviously, this mysterious receiver of the last call was cleared or his name would be up there with the other POIs who were the last to see/or hear, from Lauren.
Or, mysterious guy is a secret prime suspect, and they are leading him to believe that they believe JR when he says no message was left, when in fact JR told them he/Lauren did leave a message, and that is she wanted her phone and wanted to go home. and that was probably, IMO, because she was afraid of what JW would do/say if he found out she didn't go home.