I don't understand something here. You say the motor seized, yet you found nothing wrong when you took it apart. A seized engine will always show some piston and ring damage. Because that's what seizes....the piston and ring against the cylinder wall.

If you found no mechanical damage or galling of metal on the piston or vertical scratches on the cylinder, then it didn't seize. You may have had a hydraulic lock from excess fuel when you tried to restart it.