I bought this last year from Argos. I have the receipt somewhere if required.
I've been considering getting a one s and had one delivered the other day but I am yet to open it. If I can't sell this Forza one then I will just keep it and return the other one!
Anyway. It still has its box so would come in that, along with the controller (also Forza edition) and all cables to get it working (hdmi, possibly not the original).
I'm listing at 200 delivered. It's been well ventilated etc. Also, I'm a dad so I don't get to use it all that much haha.