FDR was a thief.
I suppose I could say something snarky about restating the obvious, but "FDR was a thief." is the simple truth.
That is not the point, these coins were not suppose to leave the mint. It would be like if the mint stopped production of the penny, yet one roll of 2013 pennies made it out to the general public. The only way that could happen is if someone smuggled them out of the mint. This was the case for the 1933 Double Eagle. Banks could not order the coin, and mint records show no coins left the mint.