Which instruments did puccini use in madame butterfly to evoke the japanese gagaku orchestra?

Puccini tried to "imitate" Japanese harmonies, but didn't have the time, possibilities or even a desire to acquire their traditional instruments. So, he settled on creating the atmosphere with standard flutes, piccolos, harps, glockenspiel (percussion instrument), and tam-tams. The only Japanese instrument he used are Japanese bells (bonsho).