We currently have bluetits nesting in our nest box, yesterday she laid 5-6 eggs and all seemed well. When we turned the camera on at 6.30 am this morning she was not there but still eggs in the nest. An hour later when we looked the eggs had disappeared. The nest had not been disturbed atall. She then returned to the box around 8.30 am and put some more nesting material in and at approx 2pm laid 6 more eggs. We are really concerned that the same thing will happen again. The nest box is on a fence post between the shed and a fence covered in honeysuckle. I am reluctant to trim the honeysuckle back as it's giving cover to the nest box. My husband has nailed some spiky material to the post in the hopes that it will stop anything climbing the post. Can anyone suggest which predator would steal eggs and leave no sign. I'm not sure what we can do to stop it happening again.