Just got the latest Coin World magazine and there's a story in it about someone who found a 1969-S DDO in change. For several years he's been saving copper (not Zincoln) cents and would search through them. He thought this coin had machine doubling at first but collectors at a local bid board told him it was the real thing (it's about a $100,000 coin).
The article said others have been found recently in unc 1969-S rolls.
Lesson #1: These coins are still out there!
Lesson #2: Keep searching... you never know what you'll find.
Lesson #3: Use this website to build your knowledge base. KNOWLEDGE IS KING!