I think it was more than likely a packaging error, the mirror plug jobby slots into a hole on the back of the t610, so you can see yourself if you wanna take a piccy of yourself. There is absolutely no way you'd manage to get it on a P800, unless you jabbed it into the antenna port with some blu-tac.
you can however, get a 3 cm diameter drill, and gently start drilling just by the camera lens, this should create a small crater good enough for the blu tack