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Does anyone know what these 'eggs' are

We had robins nesting in an open fronted box beside our shed. We watched nest building behaviour then a parent sitting on the nest. About a week ago I saw at least one parent bird going to the nest frequently over a few days then all sign of activity stopped. After a few days I crept up to the box and there was no sign of life so I poked my phone camera in and was surprised to get this image.

What on earth are they and what could have happened?