Many of these were submitted to PCGS and got graded as normal coins. They are not doubled dies. You can see this often on the 1968-1972 cents. Just the dreaded
Machine Doubling. Even the doubled dies that year showed
Machine Doubling on them as well:

Note on the date areas, you can see the date showing a
DDO. The mintmark doesn't show die doubling. But note the yellow arrows pointing to the
Machine Doubling on this doubled die. Even the minmark is showing
Machine Doubling. A doubled die can show
Machine Doubling, but a
Machine Doubling does not make a doubled die. It is the Die doubling that makes it a doubled die. So when looking for doubled dies, look at the centers of the devices, not at the outside/inside edges of the devices. On those areas you will find
Machine Doubling and die wear. The spread is on the center of the devices design:

Note how the devices are enlarged by a doubled die.
Machine Doubling never creates a doubled die. Only a doubled die, can strike a doubled die coin.