The thing he can notice about the boxes is that they're relatively common. There's a box in every 2-3 buildings, almost as if they were intentionally left in a place where they can be found again. Some boxes are frozen and too dented to open, but others respond to him easily. They open only for Vision users... not sure if he can figure that out, though?

He can find a box that was recorded by a young woman wearing a crown and a flowing dress. She talks about her father, who is the head priest of the city. Elliot may also hear someone off-screen address her as 'princess'. She feels very sick, but she still tries to continue praying for the spring and painting murals of flowers in the shelter where ill and injured townsfolk go to recover. She has faith in her father that he will get Celestia to listen to them again and drive away the winter.

Evidently, that did not work out. The princess passed away, but her mural may yet remain...?