if someone has lost some things to know how he will do to find them

Not sure what you are trying to say. If you lost something in the store, as a clerk. If you are looking for something ask a clerk.

If you mean you lost something in the store, you should ask the manager if it was turned in

Call the store ask for the manager. Any clerk will put it in Lost and Found and a customer would possibly take it or think it's for sale good luck

If not in a store bring to police they will help you I know of done it for someone else and I've found a item some one found