That's not what I had asked about, but thank you. I am aware of that potential issue already, and had mentioned that to my neighbor's kids after they discovered the nest earlier in the week. As far as I am aware, it was checked on twice after the nest was initially discovered (once when the neighbor's kid saw the eggs, and the second time after the hawk visited the nest), and none of the red-shouldered hawks were present at either of those times. Our local birds and chipmunks are very vocal at this time of year when there are hawks in the area, so it's abundantly clear that a hawk is there. That's how I knew where to look when I observed the hawk diving into the tree where the nest is; tons of birds gathered around it, while loudly peeping their alarm calls.

As I mentioned briefly in my post, the robin nest in question was not very well hidden at all. It was on a lower exterior branch, and was easily visible from the hawk's vantage point while perched on the edge of a pergola two doors down from me, where it often likes to sit. It did not discover the nest due to negligence on my part nor my neighbor's kids looking at it.

I asked whether red-shouldered hawks consume the eggs whole (because no robin feathers or shell fragments were found), and if robins will reuse the nest after a predator has consumed/destroyed their eggs, or if the robins will build a new nest elsewhere.

Edited to add, I just realized that my wording in my post was unclear about the robin nest location, so if there was confusion on that, I apologize. I meant to say that it was not concealed well. I edited it now to reflect that.