In case it gets lost or damaged, you must promptly get a duplicate registration certificate. To apply for a duplicate RC book online, you simply need to visit the Parivahan Sewa website and enter the necessary application details. This can also be done offline by visiting your nearest RTO. Before doing so, check out the list of documents required to avoid repeat trips. Do note, in case of its theft/loss, a Missing RC Challan copy will be needed from the local police station.