h1b extended on 1st sep 17,I will be eligible for dropbox if i drop passport before sep 1 or if i fill DS160 befor sep 1

USA H1B Visa
1

h1b extended on 1st sep 17,I will be eligible for dropbox if i drop passport before sep 1 or if i fill DS160 befor sep 1. I am travelling on august last week so need to confirm dates before that