I think all the muscovies died in their shell. At least 4 pipped, but I haven't seen or heard anything. Not throwing them out yet, but I don't have much hope they are still alive in there. All the chicks hatched great in the same incubator and hatcher. I don't really have brooder space anyway, so maybe it's a good, though sad, thing.
Open one and have a look, sometimes the scovies are to large to turn in the egg, seems to be a harder breed of duck to hatch.