That sounds like it to me. There should be a latch and you may see the cable from the camper plug entering it. That's where it is and what it looks like on my 880. It contains fuses for external lights and for the electric jacks on mine.
'09 Pacific Coachworks Tango 276RBS
95 Lance 880 Truck Camper
'91 F350 Dually 2WD CC 7.5L (76K Original miles!)
AirLift Bags, Reese Titan hitch, Rancho 9000X