There is not enough information to answer your question, so I ask few questions below.
Most used boats are sold “as is”, and the buyer usually buys subject to inspection.
If you’ve gone through a broker did they mention to you if you wanted an inspection done on the boat?
Was there an inspection before purchase by you or a third party?
Do you have a copy of the listing from their website?
When and where did you take delivery of the boat?
You can find this case regarding stowaways on the link below :
(Case 3:05-cv-00579 Document 100 Filed in TXSD on 08/03/07)
Masoud Jahani Esq.