Not sure what the documentation would say, but I imagine (or I would not be surprised) if the terms and conditions said something like "We have made our best efforts to verify that the watch you are buying is 100% Rolex unless stated otherwise....So to the best of our knowledge, its 100% genuine Rolex.. and if it's not, we will provide a full refund within XX days".
So even if they were 100% total fakes and Mayer did not go back within that timeframe, not sure what happens there. He would have to prove that Maron was negligent in his due diligence to verify authenticity I guess. I'm surprised Maron just didnt provide a refund so it never got to this point.
And yes, it's in Maron's interest to get this over with sooner rather than later. Regardless, this cannot be good for business.