Old Work Box in New Construction
https://inspectapedia.com/electric/Plastic_Electrical_Box_Repair.php - indicates that sometimes old work ceiling boxes are used in new construction when the final location of device is not known.
https://inspectapedia.com/electric/Plastic_Electrical_Box_Repair.php - indicates that sometimes old work ceiling boxes are used in new construction when the final location of device is not known.