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I'm sure you all have seen this. But it is good to post.
come from an article on spotting Fake PCGS Slab Diagnostics
It was good when it first came out almost 10 years ago, but they have made many changes to their fake slabs since then. That generation of fake slab shells ended around 2009. I'm sure there are some still around but most fake slabs on the market today won't be detected by those tests.