Most private boat sales are honest. But the ones that aren't tend to share a look: a price well under market, a seller who can't produce a clean title, a registration that doesn't quite match the boat, and a push to close fast and in cash. None of those prove anything on their own — so don't argue with the seller. Just check the hull.
Start with the HIN — the number a thief can't rewrite
Every boat built since 1972 carries a 12-character Hull Identification Number molded into the upper starboard corner of the transom. It follows the boat across owners and states even when registration numbers change, which is exactly why it's the anchor for any theft check. Read it off the transom and run a free HIN lookup to confirm the builder and year — then make sure that HIN matches the title and registration character for character. A ground-down plate, mismatched fonts, or fresh sealant around the plate are classic signs of a swapped or re-tagged hull.
- ·HIN matches title + registration
- ·Seller is the name on the title
- ·Plate is factory-original and intact
- ·Paperwork history is consistent
- ·No title, or "lost in the mail"
- ·Ground-down or re-bedded HIN plate
- ·Price far below market, cash only
- ·Seller name ≠ title holder
Check the free stolen-boat databases
The National Insurance Crime Bureau (NICB) runs a free VINCheck-style lookup that includes boats reported stolen or declared salvage by participating insurers. It won't catch every case, so it's a screen, not a guarantee. Your state titling agency is the other half: it holds lien records and title brands. If you'd rather not run these one at a time, a boat history report bundles the HIN decode, the U.S. Coast Guard builder record, and theft/salvage screening into one $9.99 lookup.
Screen the hull for theft and salvage before you pay — decode the HIN free or run a full history report.
““If the seller won't let you read the HIN and match it to the title, the deal is already over.””
Your pre-purchase theft check
- 01Read the HIN yourselfDon’t take a photo from the listing — verify it on the actual transom.
- 02Match it to the title and registrationCharacter for character. Any mismatch is a hard stop.
- 03Inspect the plateGrinding, mismatched fonts, rivets, or fresh sealant suggest a re-tagged hull.
- 04Search the NICB and a history reportScreen for theft and salvage before money changes hands.
- 05Confirm the seller is the title holderA seller who isn’t on the title needs a very good explanation.
Run the hull before you pay
Decode the HIN free, or pull a full history report that flags theft and salvage records for $9.99.