9/17: I went to Washington Square Park in search of Bobby and Rosie for about an hour and a half after work but didn't see either of them. I did see the tail of the squirrel Rosie caught on Saturday hanging over the edge of the branch she brought it to. That's all I could see of the body though so I don't know if she or Bobby ate any of it since Saturday.
9/18: It was raining and very windy so I didn't go to the park.
On the upside, NYU officials responded to my letter about what looks like a plastic bag in the Bobst Library nest and assured me they would see if their Facilities department can find a way to remove the bag.