I might have found a prototype xbox controller! : r/originalxbox
The Xbox One controller: Projectors, smells (!), and other stuff that didn't make it in (part 1, exclusive) | Page 2 of 3 | VentureBeat
The Xbox One controller: Projectors, smells (!), and other stuff that didn't make it in (part 1, exclusive) | Page 2 of 3 | VentureBeat
The recently revealed original Xbox controller prototypes keep up a fine tradition of absurdity | Eurogamer.net
Added a second brand new prototype alpha Xbox controller to the collection! : r/gamecollecting
List of Prototype Xbox 360 Controllers | Xbox Wiki | Fandom
Look at These Dreamcast-Inspired Original Xbox Controller Prototypes - GameSpot
Xbox Darkroom on Twitter: "New arrival: Unnamed prototype Xbox Duke controller. I believe this is the same shell/jewel revision as the one located at the @museumofplay. I've been swamped with work projects