Share 'What to do when you know another person is playing with one of your lost disc?'

I discovered today at Trophy Lakes that a person in our Club found one of my discs (at a different course), scratched off my name and had been playing with it. The only way I found this out was my disc was turned into the pro shop at Trophy Lakes after someone had dived for discs at the course. I do not know the person who wrote their name on my discs but someone told me the person recently joine…