ISPR: Army has evidence of Indian support for Waziristan Terrorists: Weapons, Papers

The launch tubes are available in the region in abundance - 82mm tubes were Soviet Army standard, given to the Afghan army during the Soviet era. Launch tubes don't get used up, the ammunition for them does. As I mentioned, 82mm tubes can fire 81mm ammo (thought he reverse doesn't work).

India already uses the 81mm standard, so ammunition from existing Indian stocks or suppliers could be supplied, rather than requiring locating a new, trustworhty source for 82mm shells.

Linking weapons is much harder. Even during the Soviet Occupation, the USA, UK, Saudi and Pakistan supplied the Afghans with a broad range or firearms, all untraceable, so that the foreign origin of the firearms themselves was hidden.