How to identify the Luxury Interior Package?

I'm in the market for an 05 RR. Given my requirements, I'll probably be locating one long distance.

How do you get the seller, especially if it's not a LR dealer, to honestly tell you if it has the luxury interior package? Is there some objective item they can report on, like the number of switches for seat adjustments? In a way there'd be no confusion?

Thanks in advance!

David