HIN's were NOT required in 1972 so they do not exist.
How do I get a hull identification number (HIN)?
If you have a boat that does not have a hull identification number (HIN), you must get one before you can register the boat if:
you made the boat
you got a boat that was manufactured after November 1, 1972.
You can get an application form from the DMV or from the NYS Office of Parks, Recreation and Historic Preservation (OPRHP). Send the completed form to the OPRHP. The OPRHP arranges your boat inspection for you. Visit the OPRHP web site.
It's just a paperwork exercise but you must go through it