GANGTOK, 31 Oct: After 6 years of border trade with the Tibetan Autonomous Region, China and many heartburns over the obsolete list of items of trade which included a season of total boycott by traders a couple of years ago and lots of “rumours and allegations” about smuggled goods an enquiry has now been launched by central agencies over the escalating inflow of unlisted items and goods into the Sikkim and other parts of the region through the Nathula mountain pass.