Hatteras will provide a copy of the original set of manuals and the build documentation (blueprints) to the new owner. As stated, you'll need the hull number and I think previous owners name. They'll re-register the boat in your name to keep their information updated.
Many of the people that built your soon to be Yachtfish still work at the Hatteras plant in New Bern. If the Hatteras plant can't help you, there are enough people around here that know Hatts VERY well.
Good luck with your purchase! Where's the boat located and who's doing the survey(s)?