Here is an idea. The box has standard AO in diffuse slot. The teapot has rayswitch with corona material in "gi" slot, all the other slots are empty. If you leave it like this, your teapot will still cast shadows rom GI. One way to remove them (kind of...) is by setting translucency level to 1 and color to white. Your teapot will still cast shadows from lights, so you can disable "cast shadows" from objects settings. This will most likely make Corona explode if more fakes are added. ;)
