Well, welcome to the boards. There are a bunch of threads where people are putting together the theoretical "printing sheets" based on the cards that have names on top or parts of other cards showing on them.
Here are some reasons they would print multiple proof sheets:
1) Validate that the colors are all coming through in the right locations.
2) They would have different proof sheets for different print groups (Sweet Caporal 150 would be different from 350 which would be different from 460). And then ones for each brand maybe?
3) Validate that team changes were made on the plates.
4) Maybe calibrating for the day?
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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