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harryThe grading companies do not know when they are grading a totally "fresh" group of "t" cards from one that has been put together over time, piece by piece. I am sure that many times, they are on the fence about whether a card has been altered or not. While most altering is probably pretty clear cut, I bet that sometimes is is questionable and hard to figure out. One day it comes back trimmed, another day it gets graded. It is just the nature of the beast with any third-party service that is ultimately subjective as humans are involved.