I assume that the car is with current owner and it is under his name. If so he has to log an entry in the nearest police stating that the book is lost/misplaced. Then he/she has to goto RMV with the police entry copy and request for a duplicate book. RMV will ask to present the car to their technical division in Narahempita. After checking the engine and chassis numbers, they will further send the car to Werahara to weigh it. Upon receiving the inspection report, the owner will be issues a duplicate registration papers. While going through this process, they will give you another form to get revenue license and insurance, if they are lapsed.
After clearing the documents, you could get the papers transferred to your name under normal transfer option. One day transfer is not possible with duplicate registration papers.