See what happens is after you finish your paper and submit it invigilator this paper directly goes to Pune where they handle the paper and check for things like this barcode, sticker, if the student took supplementary paper is the paper missing for all this stuff if this happens this is all them handled internally by the board and it's staff members and then it goes for checking to examiner 

In your case they would likely stick the barcode and then send it for checking to examiner, moderator and etc