Hello Jacob, did the owner say which shop has done the work on the boat as they may have done a compression test and know the hours on the motor. Does the owner have the service records to give you an idea when the last tune up was conducted and what exactly was done. What's the condition of the trailer, tires, and most importantly the wheel hubs. And to answer your original question on what the boat's worth, NADA guide or Kelly's Bluebook may be helpful. JB