HIN-where would it be found on a 20' SC if transom's been altered?

[minnowsnmonsters]

I'm looking at a 20' in Florida that has had the transom partially redone which is where I'm assuming the HIN is on the original boat, but the HIN is nowhere to be found. Seller has the title but to put the title in my name I believe the we need the hull ID # somewhere on the boat to do the pencil sketch as per Florida requirements.

Has anyone run into this and what can I do about it if the HIN is not attached to the boat in some way?

Thanks in advance.