You can say that the cracks(if there are any) show that the butler has not cared for it, if that's the question, you haven't provided a picture.
You can talk about the physical damage proves that the butler was careless about it and did not treat it gently.
as extra, you can say that the kettle is a metaphor for someone else the butler had treated poorly, the physical scars on the kettle similar to that person's emotional scars.