That isn't factory. I think it's a home made corner TV stand with a space underneath to hold a component (blu-ray player, satellite receiver, etc.).
See if it fits on a countertop somewhere in your rig and then you'll know.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.