Cleve,
The only way you could have seen them being scanned at Disney is when you turn them in, at bell services, to return to MCO.
I don't think anyone sees them being scanned when they arrive at Disney from MCO, because they go from the truck, in a cage, to the resort sorting point. All the bags that arrive at the resort are in the cages. They are rolled off the truck and taken inside. Most of you guys are in the parks when this happens so how can you see it. The yellow tags contain enough information that the bags wouldn't even have to go through a scanner.
Both times you went to Disney your bags appeared magically in your room. Did you go back and watch while they checked them in?