Ready for fledging

Last update on terrace box and fledging. Took box down after looking each day and seeing no activity after last bird went. Do not know if they survived. In the nest two feathered baby birds, got hubby to take a pic. Mixed in the nest an unhatched egg. Have buried it all in garden. Cleaned box and left to dry in sun. Cam box didn't have resident in it last night so will wait a few days before attempting to clean it. I wonder if it is connected to the fledging of the other box.
my.pcloud.com/publink/show?code=XZcrAI7ZYkvS9O1mCOb0nAOr907xkHHtqiRy
my.pcloud.com/publink/show?code=XZorAI7Z93JBu4z0M3JQbBE8n4MYLjUhFO2V
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The way the birds were flat into the nest i wonder if they were sat on. I turned them over. Then i saw the egg.