I'm confused on the Rambox divider... Did you guys not get one with your Rambox? Are you trying to order an extra one? My 2015 came with the in-bed divider, and it only works with the RB system. It has a lock on the center of it to lock it in place that is keyed to the same key as the truck (the hard key in the fob, not the fob itself). The small dividers for the boxes themselves are NOT included, but aftermarket ones are $30 or so. Or you can just cut plexiglass or plywood to fit. The main divider separates the bed in sections in the main area, and can also be used to extend the bed... Though it doesn't make the bed quite 8ft in length with it up.
Are you guys that are ordering RB's still getting them? If not I'll be saving mine and getting the lock rekeyed... $300 is pricey for it...