This is a good enough answer for me to go with a new mobo instead. I dont want to track down model specific items like the back panel if that was missing. I thought it'd be more related to universal items that could be easily obtained like screws. I think just the fact on the back panel not being in the box is enough to not take the risk. Thanks.
Yeah - the only time I'll take a chance on an open box MOBO is as a replacement for the exact same model.