Xbox One Xfest 18’ controllers in 4 configs

Xbox One Xfest dev controllers. Right here we’ve 4 configs, every with a unique shade Dpad/triggers and config letter contained in the battery cowl. Pink is the rarest, adopted by Blue, inexperienced, and Orange being the commonest.

Orange Config-B Inexperienced Config-C Blue Config-D Pink Config-F

Does anyone have any concept what config A or Config E may very well be for these? I’ve by no means seen them