Please Help on Baby Stellar Jays?

It could be that some died and the parents were able to toss the bodies out (if they died shortly after you took the photo) whild they were still small. It also could be that a predator has eaten the others and may be back for the remaining two. Only time will tell. It seems they were probably not nearly big enough to fledge(leave the nest on their own) if they were that small and underdeveloped only a week before they were gone.