The answer is there is no answer. The TPAs have no way of knowing if a card/item is still in their slab or not. IF you crack a card 2 or 3 times and resubmit fishing for a higher grade, the previous grades still are in their system.
The pop report only counts for a specific grader. So pop reports for PSA do not count SGC, etc. Crack a PSA and send to SGC and the same card will be in both reports.
The only thing I would be curious about is if, one company notifies another if an official crossover is done. So, if you send a PSA slabbed card to SGC to be crossed over, do they notify PSA of the switch? I would be curious to know.
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