An insulated box assembly includes an insulated box, the insulated box including a box, the box including a bottom panel and a side panel, the side panel attached to the bottom panel, the box defining a box cavity; and an insulated panel attached to the side panel, the insulated panel including an insulation batt and a sheet, the insulation batt enclosed between the side panel and the sheet; and an insulated cavity panel, the insulated cavity panel disposed within the box cavity, the insulated cavity panel including a cavity sheet and a cavity insulation batt, the cavity sheet encapsulating the cavity insulation batt.