Contact Mark Michaelson of Sailing Pro Shop. I live on the "Right" coast and he has provided excellent advice and service. He has a cat buyers guide somewhere on his website or at least he did at one time. He may know the specific boat you are considering. I know he knows that model and could help you understand where to specifically look for the leak.

That’s a lot of water. Either the person selling it doesn’t know how much a gallon is or is being really honest. Over what time period does that gallon get in there? A 2-hour sail, 4-hour or 14-hour sail? I doubt given where you live that it could condensate that much in between uses. If we leave the plugs in and the inspection port caps on, in one week the hulls will each condensate about two cups each.

The first race on our then 7-year-old 6.0 in winds above 20 and sometimes in the low 30 was for 4 hours and we took on ¼ cup. The bows were routinely submerged up to the beam in the 4-6 swells.