There is an official confirmation regarding this:
"AdSense publishers in India will receive standard delivery checks mailed via the local courier service Blue Dart for no additional charge. Cheques mailed by Blue Dart should arrive within 10-30 days of the cheque date.
So the Secure Payment option has been removed from all the Indian adsense publishers account.
Blue Dart is not able to service all areas throughout India. If you live in a location they don’t service, your check will be sent by Registered Post and should reach you within 2-3 weeks of the mailing date."
Hope this explains. For info @ http://technotip.org/blue-dart-adsense-cheque-india/