I just walked through La Tour du Pin, looking at the preparations for tomorrows Christmas market. Suddenly I was approached by a young guy in English, who tried to make me understand, that he wanted to make a phone call with a public phone. Now the phones here only work with CB or special phone cards. He then asked me in French (so what) if I could show him at the telephone how it works. There he took out a purse full of 50 Euro notes and held one in front of my face and wanted me to give him my CB to have him make a free call (as he showed me on the phone manual).
I talked to a friend from the Gendarmerie, who thinks it was forged money and/or a new crime scheme.
Maybe it is usefull to have a look at the attached link. Bank Note Security