I think it is important to distinguish between a grader, owner or president of a grading company who collects, and to what degree, and one who is an active dealer selling hundreds of thousands of dollars a year to the public. In one of those scenarios, if something is happening "after dark" then the public is really not so much at risk. In the other scenario, if there is foul play, the public is directly impacted.
There are no checks and balances that we know of. What prevents someone with keys to the establishment from walking in after hours, say, or on the weekend (hypothetically speaking, of course) and holdering a few dozen cards? How long would that take and who would know?
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