That he never raced is good, though I am still a little wary of the jumping, though hopefully it is sparingly.
He really doesn't look 16.2 but some people (even shorter people) just make a horse look small. Shrug. You'll find out when you see him.
I agree, do your own vet check. First she needs proof that he passed and for you to talk to the vet about anything/everything, even so I would suggest doing your own.
You didn't mention an actual price but a horse being slightly out of shape isn't a reason to drop it drastically.
Check out those front legs/feet thoroughly. Then go for it.