Devices and methods described herein can allow an installer to locate an electrical box preinstalled behind building material. This approach can minimize the number of cuts in the building material, which can save time and can prevent the unnecessary loss of or damage to material. In some embodiments, the devices and methods can identify a particular circuit or type of outlet box, switchbox, ceiling box, ceiling fan box, junction box, or other type of box. In one example, a radio frequency identification (RFID) tag is secured to the box, wherein the RFID tag comprises an RFID antenna. An RFID reader is configured to broadcast to and receive transmissions from the RFID tag, wherein the reader comprises a reader antenna configured to broadcast to and receive transmissions from the RFID antenna. The reader indicates the presence and location of an RFID tag secured to the box when the box is pre-installed behind a building material.