Just ran across this on Paper Money Forum and found it interesting. @SteveInTampa was keeping it a secret from us, weren't you. Ha, ha, ha.
In fairness to the video, he's talking about duplicate serials (the same serial number was accidentally printed twice in the same denomination/series), not matching serials (with different series and/or denominations). In fairness to you, a five-figure pricetag is still ridiculous even then.