My H1B visa petition has been approved on 15th October. The USCIS website says that they have sent the notice via mail on 15th October. Currently, I am waiting for that notice to come. Meanwhile, I wanted to know if I can schedule the visa interview appointment without the actual approval notice with me. The reason I ask this is because I am not sure if the approval notice contains some case number (or some form of unique application number) that I need to fill when I schedule the visa interview on the new system.