Days 1 and 2 (keys, senior citizen ID card): He felt uneasy and confused, but still tried to find a reasonable explanation on his own (such as asking the doorman) and did not call the police.
Day Three (Scarf): Fear overwhelmed rationality, and he made his first call to the police, but it was dismissed.
Days 4, 5, and 6 (reading glasses, nitroglycerin, pocket watch): After the first failure to call the police, he fell into a state of isolation and helplessness, accelerated his mental collapse, and did not try to call the police again.
Day 7 (broken finger): The nature of the incident changed qualitatively. He called the police for the second time, which directly led to the ultimate mystery of the story.
Purpose: This is a sharp allegory about the crisis of trust, identity anxiety and the absurdity of fate in modern society.