So it seems the two side panels really bear all the load with the rear panel not really being a structural piece. A problem I had though was that I ended up with 2 extra screws in shiny metal. I used all 8 of the big black hex screws. Four for the top, four for the bottom. In the picture it seems like there's supposed to be a rear spot for the two unfinished shiny screws but there's no precut hole and I can't figure out where else it would go? I have the version with 2 doors, no glass. Any ideas?