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When you threw your disc in the water and didn't retreive it, I think you abandoned it.
I don't mean this in a legal way, but in a practical way, you abandoned it. It sounds like whoever retreived it did not know you but if he is using it, at least he appreciated your taste in discs.
I have lost lots of discs and had many returned to me. I have always veiwed my lost disc as the property of whoever retreived it. I was the fool who lost it ( the vast majority of the time I threw my discs in some field and left one there). If the lost disc is one that is beloved then I will try to trade for its return and give the finder a disc they want. If the lost disc is not beloved then I would rather the finder keep it because perhaps it will be beloved to him.
For many years it seemed that the less I liked a disc, the more likely it would be returned to me if I lost it. So when someone told me they found one of my discs, it was almost for certain that it was a disc I didn't care about. The trend has reversed the last couple years and now I seem to be getting back the most beloved of the losses. Darn nice trend!