Regretably if we're not there yet, we will be soon when many alterations will as a practical matter be undetectable. In such a world a slabbed 8 will be as likely to be an altered, say, 3 as a genuine 8. When the market recognizes this as being the state of affairs, IMO prices of high grade condition rarities that lack solid provenance (e.g., coming from an old-time collection such that the likelihood of alteration is negligible) will plummet.
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