Happy to see the outcome on this one 🙂 

I don't know if this will make you feel any better, but you're not the only person ebay has targeted with these kinds of requests, granted they don't usually drag on like this, but they have asked people for this kind of documentation for high-end, scam prone items before, and it's not a new occurrence either, just perhaps an uncommon one (my guess is the Rolex triggered it - it's the most recognisable brand name and fakes are prevalent).