You'll have to subscribe to my OF for that!
You can see the darker brown border where the old panel and modem and everything used to fit...
The box on the left has a little transformer in it, but afaik I don't have any low voltage stuff so I have no idea what it's for! They put it on the left wall which is super annoying, may have to get them back to a) figure out what it's for and b) move it to below the panel so I can cover it all back up without having to have a weird bump on the wall. We did rough in for a hot tub a long time ago but never used it, maybe it's for that?