Lorosco, you'll be glad to know that your whistling tender is a collectors' item. Manufactured from 1950-1959, it is a replica of a 1940 tender. A variety of whistle types were installed in them, and some owners report that they work, but they don't work well.
One recently sold for $82 US on eBay. Another one was on sale for $50 US. Unless you paid a fortune for these cars, you did well with this one alone.