Hire a surveyor to check it over. The results of his findings should be a condition of sale.
Your insurance company may insist on a survey.
The boat should be hauled for the hull inspection - by the surveyor.
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)