Got my title for the 30 footer..
John, you ask what is the difference if it surveys all right and no one notices previous damage? The answer is 10 percent. The difference between a used boat asking price for one that has never been damaged and one with damage history, even though it is repaired correctly, is 10 percent (assuming two boats are equall to start with in every other way).
So if you disclose the previous damage, document the inspection and proper repairs and offer the boat with an added discount (use BUC or NADA data) there is a mutual ground for a responsible business transaction.
One last thought ... there is always "secondary property damage" to consider after any incident. If it shows up during subsequent repairs, it would be very difficult to explain unless the primary damage history had been disclosed at the time of the sale.
After a buyer''s lawyer gets into the picture, all bets are off as to the outcome.
(just my $.02)