I was one of the lucky ones! The Letter and Envelope dated August 15th, 2000 was from the NY Institute Of Finance, also located in Tower 2, 17th Floor. That was where the class was held. The item "World Trade Center ID Credit Suisse Letter Envelope NY Institute Of Finance 17FL" is in sale since Saturday, September 21, 2019.This item is in the category "Collectibles\Historical Memorabilia\Fairs, Parks & Architecture\Buildings". The seller is "ljt110303" and is located in Pompano Beach, Florida. This item can be shipped worldwide.