The hotel lost its cash for some reason, and it has been half a month. Today, I went to check the monitoring and said that it was only ten days. Is there any way to get it back?

If you lose a lot of cash, then I suggest you call the police. The police can resume monitoring or get clues by other means. But it has been lost for half a month. Even if there is a clue, the possibility of getting it back is not great. Don't hold out too much hope. Think of it as a lesson at your own expense. Don't forget things in the future.