A quick aside before I dive into my cornflakes (the maidservant is making encouraging noises with a frying pan as well and a higher call will soon take me away).
The IVC has NOTHING to do with an Assamese or a Keralite, if that's what you call a Malayali these days. On the other hand, it has nothing to do with a Sindhi or a Punjabi either. It is a lost civilisation, and bequeathed none of its gifts to anyone in passing. As I have said time and again, those who live in the Sindh and in those areas of western Punjab which contain the remains of IVC sites have ticketing rights; so, btw, do Gujaratis, Rajasthanis and eastern Punjabis. It does not belong culturally to anyone now. It does belong geographically to Pakistan and to India, not in equal measure, but to both to the extent that the ruins and remains are present.