I lost $100 in the laundry, who won? I lost a 100 dollars bill in the laundry (it was destroyed).
I clearly lost 100 dollars.
Where are they now? Who won 100 dollars?
The central bank that issues the currency won; they can now issue an additional $100 without increasing the price level. This is similar to seignorage rents due to overseas circulation— in fact, to a central bank, the two are indistinguishable, as the central bank would be unaware that your note had been destroyed.