Was it instead the last control or did you compare the brick times? Sometimes setters synch the start and finish only (I had to do this once after the setter had put out all the bricks) and the others are out but more than likely none of them have been done. Of course at Tash's last event when she tried to synch the bricks (as not many of our setters seem to do), there was no master brick in the box!
There were actually three finish units, two apparently had the same "real" time (i.e. synced with the start), but the one I punched was way out,so much so it was really obvious. So they are going through the results and seeing who they have to add 1:26 to. Anybody with a negative finish split is easy.