First h1b stamping for extension period


My current h1b expires on Aug 7th for which i have recently got an extension for the period Aug 7th 2018 - March 2021. This is my first stamping for h1b. While filling the petitioner details in DS 160 and ustraveldocs, i am asked to give the start and end dates of the petition along with the case number. My visa interview is scheduled in the month of July. Since the beginning of my h1b period, employer and client information are just the same. My return flight is on August 11th 2018.

Which receipt details should i be giving? The current one that i am working on or the extended one that have been recently approved. I am thinking that i should give the latest petition details (receipt number, start and end dates). Please correct me if i am wrong.