That's entirely possible. If you know where to look, you'll be able to see it every time.
I'd really like to get one of these cards in hand to see how good the alterations are and if I can tell.
I will say that if the time allowed for inspection is under 1-2 minutes, the work doesn't have to be all that good.
Given a bit more time, and even pretty good alterations should be detectable without much technology. And given a very good amount of time and some specific info on that particular issue, there should be almost no undetectable alterations.
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