As the old saying goes hindsight is 20/20.You should have had the seller produce a title before buying the truck.I once bought a streetrod complete with title,but there was no VIN no. anywhere to be found. I stamped the VIN from the title on the frame,and had no problems. That same car has been bought and sold at least six times and a couple of the new owners were dealers,with no problem.I live in Ohio and they will recognize a signed bill of sale if it comes from a state where they do not title older cars.But you still must have the VIN on the bill of sale that matches the VIN on the vehicle.