If you lose it in the gym, the gym has the responsibility to help you find it back. You can negotiate with the gym staff to see if it can be solved in the form of monitoring or alarm.

Generally, whether the lost items can be recovered depends on the situation. In principle, the police can refuse to accept the loss of items caused solely by their own fault, but if the lost items are occupied by the picker and refuse to be returned, they can call the police and apply for filing a case to recover their items through legal channels.

Tips: When you go to the gym, you must take good care of your valuables to avoid losing them.