A blogger I know knows various people from E Europe (Romania and Yugoslavia). At least two of these guys went through hyperinflation in the 1990s (or so). Neither reported that silver (or even gold) was accepted as currency.
US dollars and German marks only.
Having lived in the Balkans for the first half of my life, I can confirm this is true. You can add the Swiss CHF to the list, and of course replace DEM with EUR today. Lots of wars fought in the past, so people usually were opting for banknotes (majority) or small gold jewelry (those who had it), both of which could be carried in case of SHF, which was often.
Also, these currencies were/are perceived as stable, so it was/is a way to preserve purchasing power during hyperinflation times. Lots of people hold reserves in these convertible currencies, just in case.