The Law on the Protection of Consumers' Rights and Interests stipulates that "consumers have the right to protect personal and property safety when purchasing and using goods and receiving services." When you surf the Internet in an Internet cafe, you naturally form an agreement with the Internet cafe to receive services. Therefore, Internet cafes have the obligation to ensure the safety of your property from being damaged. Due to the negligence of the management of internet cafes, you were stolen. According to Article 11 of the Law, "Consumers who suffer personal or property damage due to purchasing or using commodities or receiving services have the right to receive compensation according to law."
So you can claim compensation from the internet cafe. However, when reporting a case to the public security organ, you should also complain to the local consumer association or file a civil lawsuit with the court, so as to safeguard your rights and interests. However, it is not feasible to count on the police station, because the detection rate of such cases is very low, and it is very time-consuming and economically burdensome to go to court. If you can't prove that there are any valuables in the bag, it will be very troublesome.