Robins nest in out-building, some queries

I have an old out-building that’s used to store all kinds of junk, including a pile of badly stacked cardboard boxes. The out-building has an open window. The other day I was clearing out some of the boxes and on moving one found a bird’s nest partly secreted on top of another box (which itself is on top of another box and various junk). The nest had in it one small brown egg, maybe half an inch wide and a little longer. I assumed it had been abandoned but just in case I shored up the boxes around the one that the nest is on to prevent any slippage. I didn’t put the original box back on top of the nest in case I crushed it. Checked again today and now there are three eggs, so obviously the nest is in use. My concern is with the boxes and what happens when the young leave the nest – there is wide ‘chicken wire’ (diamond shaped, about 2 inches diagonal) to one side of the nest and the open window is in that direction too (although the wire doesn’t go all the way up to the ceiling, there is a gap of at least a foot at the top of the wire). I’m thinking that if any young fall out of the nest or flutter to the floor then they’ll easily be lost among the assorted junk and the parents won’t be able to get to them. I also can’t imagine that they could easily flutter to the window from where the nest is situated. So, what to do? Leave it as it is and hope for the best? Or move the box and nest to the other side of the chicken wire and hope that the parents don’t abandon it? Thanks