Hello D, I'm visiting this board after a very long time. Infact your query is also being replied to after a loooong gap. However,for the benefit of others - YES ! Registered airmail - Letter service is 100% for sending articles as well and not just letters! Infact,it is now compulsory to attach Customs Declaration form (CN 22) with every mail. You need to include information about the contents inside the mail. (Had it been only for letters,like some silly clerks at the post office still say,then customs form would not be necessary!) For example if you are sending chocolates,write something like "Nutrition/ Healthcare" on the customs form (ha ha).
Regarding pricing ,it is available on Indiapost website for all articles. As of today, a 20 gram registered letter sent by airmail would cost 75 rupees. The pricing goes up with added weight. you can send only articles weighing upto 2 kg using this method. If the weight is higher than 2 kg limit ,use SAL service.
Smaller post office and small towns usually are less knowledgable,so if you come across a difficult clerk,try visiting a different post office!
Hope the above information is helpful to you and many others!
