you´re right, according to the Incoterms, you already fulfill your scope of supply.
But I would kindly ask you, or your colleagues in the US, to support within short and clarify with your forwarder CEVA, what has to be done to ship the camera system back to US.
You´re not responsible for this change, therefor you do not have to accept the cost for this additional shipment.
But please assist, before the Indian customs will transfer the system to different stock or, worst case, destroy the goods, because nobody do the customs handling and pick up the goods.