What clues are in the story that tell you that Mr Dorian is not worried about Fern?

In the story, Mr. Dorian's lack of urgency or concern when Fern goes missing suggests that he is not worried about her. He dismisses her absence and seems more preoccupied with his own affairs. Additionally, he does not take any immediate action to search for her or inquire about her well-being, indicating his indifference towards her.