Nesting Coal Tits

I have a coal tit nesting in a box which has a camera in it. Late on Wednesday afternoon she laid 4-5 eggs and seemed quite settled. Anxious to see what was happening, early the next morning I discovered a box with no bird and no eggs.  I could see a coal tit around the nest box for most of the day; it occasionally went to the opening, peered in, but then flew off. Then at about 8pm I switched on to find the bird and eggs back in place.

Is it feasible that the bird could have 'buried' the eggs in the nesting material and then gone back to them in the evening?

This is my first season with televised nesting, and I am intrigued!