In Kolkatta also, you should have sent
RTI application by speed post AD addressed to
PIO, Passport office with IPO of Rs10/-. For Kerala, you can file application by post addressed to
PIO of Dist. Superientendent of Police, ERNAKULAM. Pl. visit Kerala govt website to get format if prescribed and amount and mode of payment of filing fee. If no format is prescribed, you can use format you used for Passport office. Passport office falls under central govt. while police dept falls under state and hence state format, amount and mode of payment will have to be followed. My experience shows that applications sent by speed/regd. post Ad are well taken care of and applicant saves time, humiliation, and travelling cost etc.