If you find valuables lost, but there is no evidence that others took them, the best way is to call the police as soon as possible. When calling the police, you can provide the police with as much information as possible, such as the time, place and characteristics of the lost items.

At the same time, you can also try the following methods to investigate:

1. Ask a friend of a friend: You can ask a friend of a friend if he knows the lost item, or if he has seen or taken your lost item.

2. Check the surveillance video: If your place is equipped with surveillance video equipment, you can check the video to determine whether strangers have entered your room or area.

3. Seek legal help: If the problem cannot be solved by other means, you can consider seeking legal help. You can consult a lawyer and learn about relevant laws and regulations in order to better safeguard your rights and interests.

In short, in the absence of evidence, it is best to call the police as soon as possible and provide as much information as possible to the police for investigation and handling. At the same time, we should also pay attention to protecting personal privacy and safety, and avoid letting strangers enter and leave their homes or workplaces at will.