Was speaking to one of my buddies in the Program today by phone and while we were talking the incubating adult got up and it looked like there was one egg and perhaps one broken egg in the box, but no chicks yet. They are technically overdue, but so were ours by a week, and according to my friend, it not unusual for their birds to hatch out later than the mean average, so no worries yet.
On the less positive side, this is Radisson's first nesting attempt and its later in the year, so if she only has one, that's still a good outcome!