The small bag of moon cakes I just bought today says 20 12. Is it 12 leftover moon cakes?

There may be two situations: 20 12 may be the production date of small packages. Another possibility is that the factory number of this kind of moon cake can only be these two cases. Look at your picture, the moon cakes are not bad, especially the moon cakes with this filling are more difficult to keep, let alone years or even months. I hope my answer is helpful to you.