That's what I thought, too. Maybe literacy arrived very late in that region and there were no written records except for what was in the temple itself. I don't know if India has written records that go back centuries like Europe.
That would make sense. I really don’t know much about the country in terms of its evolution.
I don’t even know what the big cities were like then there, no less outside villages :-)
The largest libraries and universities in the world were in ancient India. All burnt to the ground and destroyed when the peaceful religion arrived in India.