Is this freehub a Shimano or Campagnolo type?
Google image search for 'Shimano Freehub' 

Google image search for 'Campagnolo Freehub'

Comparing images, I'd say that is a Campy freehub. Shimano Hyperglide freehubs have shallower splines.

Personally I'd be a bit cautious about a seller that doesn't know or can't provide details about the wheels.