Final answer:
The provided excerpts do not clearly state what John notices is missing when he gets home, but they suggest themes of loneliness and disturbance in his domestic environment.
Step-by-step explanation:
The question regarding what John notices is missing when he gets home requires piecing together information from various provided excerpts. Unfortunately, none of the excerpts explicitly mention something that is missing when John returns home. However, they do offer a glimpse into his experiences, perceptions, and the atmosphere of his surroundings both inside and outside his home. To determine what is missing, one might infer from the context or identify thematic elements such as a sense of loneliness, solitude, or a disturbed domestic setting.