Final answer:
The given reference information does not include any details relevant to Henry, Keiko, or the hotel, making it impossible to answer the question about why Henry believes he might find Keiko's things in the hotel.
Step-by-step explanation:
The question asks what convinces Henry that he might find some of Keiko's things in the hotel. However, after reviewing the provided reference information, it is clear that none of the text given offers insight into the relationship between Henry and Keiko, the hotel in question, or Keiko's past interactions with the hotel. As a result, I cannot accurately answer this question based on the information provided. It is important to note that when seeking help with inquiries related to literature or a specific text, providing context from that text is essential for receiving an accurate and complete answer.