Do disposable shoes in the hotel have formaldehyde?

I don't think so, and it's a disposable product. Throw it away when you're done. Formaldehyde will evaporate quickly in the air, and the disposable shoes provided by the hotel are not used immediately after production. Manufacturers have to go through the process of supply, marketing and wholesale before they can reach the hotel. Even a small amount of formaldehyde will volatilize.