A replacement would not likely have included the certificate at all. IDK if salesmen were provided with all of the bling for these knives or not. The poor hunter or bad Boy Scout whose parents took away his knife may have sent the registration in upon purchase, then ignored the knife afer he stuck it in his drawers. I mean...
It is always a puzzlement to imagine how so many useful knives survived the years without someone using them, or at least being tempted to rub them down with a gritty stone, particularly when they, for the most part, predate knife collecting as we know it now.