Let's say a question is asked on SO and it's voted to be closed and moved to SU. That leaves you with an empty question. Why not provide some visual cue as to what's happened to it? The easiest way to do that is to change it's appearance.
That could be as simple as changing the "X votes, 0 answers" box to be styled like the destination site. It could go even further but I think that one box is enough.