If you have opted for bedroll while booking your ticket, get the same immediately when you board the train.
Attendant will not keep your bedroll on your berth. Bed roll would get over when train reaches Mangalore.
I have opted for bedroll while booking the ticket and boarded the train from Kannur. Attendant was distributing bedroll for those who were not opted by taking Rs. 25 from them. I was expecting that, since I have already paid the money while booking the ticket, he would have kept the same in my berth....
more... There was a bedroll on my berth. But it was bought by another passenger who boarded from Calicut. I thought that was my bedroll.