1705h
I did a buzz around with the camera and couldn't see anyone, adults or chicks. Keep in mind that I can see immediately west of the Hotel for only about 5 blocks (except where the Hydro bulding is). When Hurricane and her sibs and Loki and his sibs fledged, they used the window ledges on the Hotel as safe havens from the wind. Given the wind as well, they could just be hanging out out of the wind and out of sight of the camera. When the wind dies down, they may return to the nestbox.
Beatrix - keep in mind that it too Cade 2+ days to return to the nestbox, she only left yesterday and of all the chicks, she's the one who fledged because she meant to fledge. Carson & Fyfe bumped each other and Cade didn't quite make the corner of the nestbox when he was jumping up from the ledge. Beatrix, she fledged like she'd been flying for years.
Coming back to the box - now that Beatrix has fledged, there is no one to company at the nestbox or ledge. When Carson returns, if he hangs out for awhile before trying his wings again, Cade and/or Beatrix could return to keep him company. But we have had had other nests - Hurricane, Chinook and Mistral most recently - who, as I recall, never did come back to the box or ledge once they fledged. Vesper and her brothers, Loki and his siblings both did and did for quite awhile. Will be interesting to see who Carson, Cade and Beatrix take after.