Marconi in Switzerland True story or fairy tale ?

According to the reminiscences of a senior citizen, at some time during the summer of 1895 Marconi carried out original wireless transmission experiments near the village of Salvan in Switzerland. The IEEE acknowledged this event and inaugurated a Historical Milestone on September 22, 2003. And now the ITU recognized the site of Salvan “for its invaluable contribution to the Telecommunication Heritage.” But Marconi apparently never mentioned the name of Salvan, and this historical episode is not recorded in the archives of the Marconi Museum in Pontecchio. Why?