When the new USD bills were printed, almost all exchanges required new, undamaged bills. Any bills containing tears, marks, wrinkles, or that were of past issue were rejected. This is not so common now, as new bills are in common circulation. However, if you wish to exchange large amounts of money (not recommended), you may still be asked to produce fresh bills.
At any rate, it's best to ask your bank before you travel to Eastern Europe if they can give you some new, undamaged bills to take with you.
Back to Do's and Don'ts for Currency Exchange in Eastern Europe.

