H1b blue slip - Passport not retained


Attended H1 b Visa interview @ chennai consulate. Got blus lip says admin processing. They have retained 797 and tax papers, client letters. No clue how long it will take as my passport is not retained. 797 has been approved only 10 days before. during the interview, they have asked for I129 but i couldn’t provide that document [had carried my baby and couldn’t find it from my file at that moment]. Is that the reason i have received a blue slip? how long will it take? can i work from Idia meanwhile? please help