I wonder how unique these are. Some, like the frontal red ghost I have, look like production cards - if that's the case, there should be at least a sheet's worth of cards with a red ghost offset one inch to the right. No telling what percentage survived, but such cards provide a huge hint as to what cards were printed on the same sheet - in my example, just look for red ghosts with the same offset to the right. Not definitive, but good circumstantial evidence.
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$co++ Forre$+
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