So if they already have a pretty darn good idea you murdered someone and the government asks you where the body is and you refuse to tell them and they lock you

So if they already have a pretty darn good idea you murdered someone and the government asks you where the body is and you refuse to tell them and they lock you up then that's not a 5th amendment violation? In the hard drive case and the hypothetical body location case the government is trying to compel speech that directly leads to incriminating evidence. That seems like a solidly 5th amendment issue to me.