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If you look at the billions of cents produced by the single squeeze hubbing process, it is an indication that even the best of machine operations can produce unexpected results. Either a series of conical die blanks were slightly off ( some say tilting of a fraction of a degree can cause the "chatter" ( don't know the proper term) or the holder of the blank was slightly off. The mechanical reason for this variation gave the series of Doubled dies in a series of runs before corrections occurred ( assumption). It would be expected that each DD was a single die run and limited in number. Due to the rush to get the mint rolls ready was probably a factor. It appears most of the cents from this situation peaked in the packaging of the mint rolls of 4/23-5/1.
I have not heard of any yet from OBW rolls/bank boxes. They seem very common now as each one that is found seems to be announced in a forum ( mea culpa). When the dust clears, I expect each to be about a die run's worth, but since most seem to be recovered, the population should be high. IMO.
Jim
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