I smell a bargain
If this is really the boat you want, i would check out the damage, if not to bad get in there with a lot cheaper offer to save him the grief of the repair.
Just read the item on the g/box you've posted sounds a bit suspect, i had a L/H box on a merc 200, Nightmare getting a range of props, i changed to a R/H one, but this one sounds like lots of cash reading your other thread.
Unless this is a bargain listen to what the guys here are saying.
Good luck whichever way you go.