Another egg out of the nest

Yesterday evening we looked at box 1 and to our dismay found that one of the two eggs has come out of the nest. We're currently waiting for an opportunity to get it back in there but it seems less likely that we'll be able to as time goes on as one of the birds is always on the nest. We could try putting it back anyway, but risk flushing the sitting bird and losing any hope of the second egg hatching, but we'll keep an eye on it for any opportunity. It may be too late anyway, since the egg has been out of the nest for several hours overnight. Here is box 1 showing the stray egg yesterday evening:

Box 3 are still doing well with their three chicks, the young are growing fast and taking up all the space in the nest now: