Say, today you live in a house with your family, kids, your furniture's, etc. Tomorrow you move to a different house, then who will be the inheritor of your family, kids, furnitures, your family history, culture and heritage, you or the new owner of the house you left behind?
The history, culture, legacy, identity, heritage, and its artifacts of ancient Indian civilization (also known as IVC) are safely with us Indians, the true inheritors.
Pakistanis have already discarded and disowned all of it, now this kneejerk reaction to claim it is devoid of any basis.
More importantly, your radicals might be offended about this claim and put those artifacts into the risk of getting destroyed, if those are handed over to pakistan just for argument's sake.