The key given when handing over the house is left to the property. Which one should I give him?

Keep one of the above two keys. At present, the security door keys are generally divided into a key and b key when handing over the house. Generally, there are two keys A and five keys B, which are used by construction and decoration personnel in self-maintenance or decoration of the project. When the project is officially moved in, start the B key, and the A key will automatically become invalid.