Final answer:
After thinking his wallet was stolen, the man reported it to the police immediately. He did not accuse his neighbor or conduct a thorough search of his house. Cancelling credit cards was not mentioned in the question.
Step-by-step explanation:
After the man thought his wallet was stolen, he reported it to the police immediately. This is the most appropriate action to take when faced with theft. By reporting the incident, the man can provide necessary information for an investigation to take place. Additionally, reporting the theft can help prevent further fraudulent activity.
It is important to remember that accusing someone without evidence can lead to misunderstandings and strained relationships. Therefore, the man did not accuse his neighbor of the theft. Conducting a thorough search of his house might have been a helpful step in case the wallet was misplaced or left behind, but the question does not provide any indication that the man took this action. Lastly, cancelling credit cards can be a precautionary measure taken if the wallet contains credit cards, but the question does not mention credit cards specifically.