I can fully appreciate the concerns over the credibility and provenance of this item.
It's from McLaren's factory, that's accepted. However, given both the claims made over it's history as well as it's very high value, I can appreciate why it's important that details have to be ascertained if posting on the AF F1 page ... the reputation of this forum should always remain professional and unsullied and I'm sure the motivations of the posters above are simply to establish the authenticity of an item that has been posted for sale by a brand new member of this forum.