This is likely the case Scott.
The scraps knowns as the "yellow browns" are a group of 34 cards (including Magee) that we see grouped together across many 460 brands. I believe the finished sheets of these 34 cards were printed as F30 but never cut and packed up, they were sent over to the OP print press first.
One/two of those sheets was thrown out before all the front ink layers were applied and the back F42 OP, giving us the yellow brown scraps.
It's also likely one/two finished sheets also never hit the OP press and we get natural F30s that weren't intended to be packed up.
Here is a yellow brown Magee with a F30 back.
