If your in any doubt then don't buy it buddy. Honestly you will have to pay more for a genuine one off the boards but it will be a ten times safer transaction-99% of the sellers on here and rs are genuine. There's a few guys on rs who sell genuine ledy- EBay is an awful place to buy this sort of thing.
Also don't be fooled by the buyer protection- if it's a fake you will still have a nightmare to get your money back.
I think I should add here that I have no idea if it is real or not, what I'm trying to stress is there will always be another, and if you have a hint of doubt then leave it.