Parmigiano Reggiano doesn't have packaging per se. It travels very well because of the crust, and because it's a fuck-you heavy wheel of aged cheese, as long as the temperature doesn't get too high. The Parmigiano Reggiano consortium is living proof of a good idea ruined by the profit motive, and becoming the standard/goal for any other smaller, consortia. So yeah, very likely they just put the microchip somewhere in the crust (which nobody eats and is only good to put in sauce/stock)