They check deposited certs against a database. If the number is not present, it's assumed good. The cert is then routed thru the system to the DTCC back to the TA for reregistration. The second check (DTCC to TA) is where they were picked up.
----- "We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful." -- Warren Buffett
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