What i know is that in 99% of these cases it's a paypal that it's scammed at the end. Because you pay gen watch but receive rep, so you file a case with paypal with all documents needed (authentication from AD) then paypal just give back the money to the buyer and try to take them from the seller, but if the account is registered at the other part of the earth it's pretty difficult to take the money back, usually this accounts are registered to very very poor people in India, China or gypsies from East Europe, people that are untraceble and if even the collection company or police get to them they have nothing to be taken to cover the debt. It's very popular scam, but normally is performed with easy sell and less costly items like iphone-s laptops or thing that are not over 1k $ because normally for paypal (or collection company) is very expensive and time consuming trace this low-value scams if the accounts are registred outside the big countries with good working police/collection institutions. That's why paypal only covers payments for up to 9k $ and the seller of this watch looks for 8k