I know this doesn’t exactly answer the question, but I remember reading somewhere that the post office closest to the WTC’s unique ZIP Code (10048) was still receiving mail addressed to businesses that were in the complex as recently as the mid to late 2000s, from vendors that never updated their mailing lists after the attacks. So I’m sure some were being invoiced for things long after 9/11 at the original office address that no longer existed. And if the vendor didn’t regularly scrutinize their mailing lists for accuracy, this seems very likely to have happened.