It used to be that the only way you would know was if you sent a SASE to the bureau. Then you waited. Or maybe you got lucky and a generous QSL sorter dropped you a postcard to let you know cards were on file for you. Now, however, the answer may be just a mouse click away!
If your callsign contains a five, the person responsible for sorting your cards has posted his or her database online. It's waiting to searched right now! Search it from our own Operating Page or click through to the Bureau's website and search from there. Good luck!