The NICB records are nearly 100% complete back through '62. '61 is a little sparse. Every MSO (or MCO) was sent to them. I found my '62 (through a police friend when it was easier) and it was never stolen or salvaged. That's how I verified the original selling dealer of my car.
And I apologize to everyone who thinks I was bashing or posting non-appropriate historical information regarding overspray.