I tend to think that a tech grade of EX to EX+ would include the strong possibility of gum stains on the backs. Maybe if they had been NR MT, you would have a legit beef, but in any case, couldn't you have asked for back scans before the auction end? Man, I wonder how long it would have taken me to complete a '52 Bowman set with no gum stains - many years, no doubt.
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