I'm thinking of buying a watch - the seller is very reputable seller on timezone with tons of references on good guys. I have been in a lot of contact with him over the last month as he tries to find the right watch for me.
It's a pre-owned watch I would be purchasing for a about $3500, maybe a slightly older series but the model is still out now with MSRP of $8k.
So I'm fairly confident in the authenticity of it.
But as far as resale value - there's really no way to have the company "re-authenticate" it with new papers - for a fee?