Confusion on Odometer reading from 1st dealer to the 3rd dealer on Toyota Sienna

Check with DMV. Maybe just a typo. but they can tell you! Where was it sold originally as each time a reasignment of title is done it is recorded at DMV with current mileage. They will be very glad to check this out for you! Also mileage is recorded on the annual vehicle safety/emissions inspections, if in PA. or other state(s) with this program. Many ways to find out. (See next answer!)

Sure sounds like its been rolled back. Another thing you can do is get a CARFAX report. I can check its service history with the vin # for you. Service reports show mileage at service visits if the servicing shop is contected to carfax.