I think its a genuine watch tho.. tbf
The watch itself is genuine (it is not VSF clone if that was the concern), 2 plastic cards are correct, the wooden box is correct for 2016 watch, BUT it comes with the incorrect packaging.
Black outer box, black leather case for the cards and black interior of the box means the packaging if from GMT 43.5mm PO.
If you are considering making him an offer - ask him for the photo of the serial number (on the bridge and on the plastic cards) and the go to AD to run the serial so you can be sure the watch was not stolen.
Also, a bezel insert seems to be scratched so I am not sure is it worth the asking price tbh.