I guess it's hard for a paper bill to become silver :).
Related:
Exchange of old banknotes to PLNI read somewhere that old banknotes (from the post-PRL-inflation days) are still valid for exchange in NBP until 2010. Does anybody know if it's true? And if so, what is the rate of exchange? I've still got a bunch of old banknotes at home (mostly since i'm so nostalgic and didn't want to gt rid of them) and I was thinking if it was worth exchanging them. I've got about 2.000.000 old zloty.
That'll be 200 ZLP. About 60 beers. You can exchange the old currency for the new one until 31 Dec. 2010.