There are several ways to determine the condition of a vessel, including requesting an appraisal. What's important here is that the person buying the vessel knows its condition.
This is the step the person selling the vessel must take. In fact, for the buyer to know whether they will be able to maintain the vessel, they must first know its condition. They can then explain how they intend to maintain that condition. There are different ways of doing this, but the intention must be there.