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I believe the collector boosters are all foils, so that particular trick may not have worked in this case.

The foils aren't worth as much now as they sell collectors booster packs which contain almost all foils.

Additionally, who wants another man’s soggy taco?

I did this in the early 90's with a particular series of baseball cards. Good money for a kid. I used a micrometer as well. Glad to hear it still works!