We checked the Tower site last night in the rain before leaving Brandon and only a crow was in residence - perhaps the McKenzie Seeds crow? Who knows but that was the only bird we could see when we were there. We check out the site for camera angles etc at the nestbox so if someone does turn up we have a plan in place already. And no, there hasn't been any disturbance in the nestbox - and the box looks great after its first winter in place. There is some pooling of water on the roof in spots but the bottom of the box is raised up above the roof a bit and then there is 3-5 inches of gravel so if this box is used, no one is going to have problems here!
The folks at this site are keeping an eye out for the falcons (they are big fans of the falcons) and RCF and Rose have been great at spotting who's home pretty much as soon as their home, so if/when someone does turn up here, well, we should hear about it almost immediately I expect!