At the risk of sounding like an idiot..............David P's advice is good - keep the box and code at home - there are usually 2 keys - only keep one in the car. Sounds obvious I know! But its a load of hassle if you lose the lot. Alfa dealer will have a master set of keys (may not have the older triangular type) that can be used in the event the original keys go missing. Ask yourself if your car really needs locking nuts?