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If the mom was sitting on them and then you put them in the incubator for 20 days it is very likely they are close to hatch. Mallard eggs take 28 days that would have started with the mother's sitting. If they are true wild the mother would be brown. If you mean brown, but not like a while...

On a viable egg veins would be visible on day 19, and you should be able to see the duckling moving.

Any idea what type of duck eggs they are?