Need advice - buyer claims watch received fake

[Everydayisanewyou]

Anyone ever have this problem with an in person transaction? What proof did you need to back up your claims? Im currently dealing with a similar situation. The buyer claims he took it to a jeweler that says its not authentic and wants his money back after one week. I offered a full refund the same day if he would agree to meet me in the local police station but he refused and wanted me to meet him at night in a city nearby that is very unsafe. Personally I think he has buyers remorse and trying to return for no reason and probably swapped the watch and showed the jeweler a fake if he even went at all. I'm currently waiting for a duplicate copy of the watch report from WGS.