You can get very good advice by using an artificial intelligence assistant such as GROK.COM to help you assess boats that are on the market from their published listings, as long as you give GROK useful criteria for evaluation.
For general advice on buying a used Boston Whaler boat, see my 26-year-old article in the REFERENCE section at
Buying Classic Boston Whaler Boatshttps://continuouswave.com/whaler/reference/buying.htmlThe only things that have changed since I wrote that are the prices and the age of the used boats.
You can also post in the MARKETPLACE forum a notice of WANTED-TO-BUY and give more specific information about the boat and engine and other elements of your desired purchase, and a means of direct contact with you and your location. This might attract potential sellers to you.
The MONTAUK 17 remains an extremely popular model of Boston Whaler boat, and used boats in very good condition that have modern engines and are appropriately prices sell very rapidly. To become the new owner, you need to be among the first to actually see the boat in person, and bring cash or an easily negotiated check with you. Nice MONTAUK boats do not sit around for months waiting for a buyer, unless they are priced at the very top fringe of reasonable prices or are exotically restored and equipped with much added gear.