You could try a hand, coat hanger, auger, or anything. If that doesn't work pull the toilet and try looking up the backside to see if you can see it then try a garden hose spraying backward from the underside, or try pushing the garden hose backward through the trap to dislodge the item. My favorite item pulled from a toilet was a plastic smiling flourescent green alagator, strangest was a marijuana test kit at a police station.