I have 4 finches, 2 females 2 males. The two that use the right side nest have been laying eggs. The two that have the left nest have been putting some of the fresh food snacks in their prepared nest. Last night I decided since I haven't seen eggs in the left one I would pull out the food.
Moving a finch egg.
I dont think so. Mother Nature has a way of taking care of things. That egg may have been unfertilized. There is no harm done moving it into a nest. Either it will hatch or not.
I think you were right to move the egg to the nest. However, you are not sure which set of birds laid this egg.
I hope your finches are taking care of their eggs and you will have new babies soon.