I recall maybe around 10 years ago PSA had even admitted in writing that they apply invisible markings to their customers' submissions. I called and spoke to someone at PSA about this and could only get them to say that it is their practice to mark memorabilia in this manner. That way, the COA can be definitively linked to the memorabilia item in question. But the question remains - if it helps PSA to re-identify items other than trading cards, why wouldn't they also apply these markings to trading cards as well for similar reasons?
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