Always wait it out when in doubt. Checking your other post you say you have 2 other boxes. If this is a new female, she will most likely start a nest in the other boxes or on top of the existing nest. Only if she begins a new nest on top of the current nest would I remove it. If you see no changes after 2 weeks, it would be ok to remove in my opinion. Just wait it out and let nature take its course. Do you have any other birds interested in the boxes?

I've been lucky enough to "host" chickadees for the last 6 years. The first year it was a little war between the bluebirds and the chickadees. The bluebirds have always, w/o a single exception, used the back yard nest box. They already had five eggs and incubation had started when the chickadees started nest building in a front yard box. The bluebirds were having "none of that" and constantly harassed them by going in and out of the dee nest box. I was advised to add a 1 1/8 or 1 /14th inch hole reducer to keep the bluebirds OUT and I did and things were fine for both the bluebirds and the dees. I have bluebirds in the back yard right now and the dees have laid their third egg today in the front yard box. So far, the bluebirds are not bothering the dee box but if they do I'll add the reducer again. I agree with Elly, do no disturb that nest. It's possible the dees will return or that they have and you've just missed seeing them. While they do incubate every day it's possible they have not started incubating yet. Most times females do start incubation the day before, day of or day after the last egg is laid but not 100% of the time so it's premature to think they won't return. I would recommend that you add a reducer to keep the bluebirds out of the box. If, after that, the chickadees don't come back for a full week then I'd remove the nest and eggs and the reducer. But, be sure you've had a chance to look at the box for a full hour before assuming it's been abandoned.

Birds have no way of transporting their eggs...with the possible exception of some ground nesting birds. Either the eggs hatched or something got at them.

Hi- I have what appears to be the same bluebird pair come back to nest in a different box in my yard this year. These two have always been together by coming to my feeder & when building their nest. However, I have seen him in the last few days, but not anywhere around her or the nest box. He'll come to my courtyard to get mealworms or drink from the bird bath, but then flies off somewhere else while she is either in the box or perched up in the tree where she can see the box. It's as if they broke up. I'm worried that she's being left alone to deal with the situation. He doesn't come around to feed her or attend to her at all & I never see him perched up in the tree nearby like he was before. I put up the sparrow spooker after the 2nd egg & I'm wondering if he doesn't like it as I didn't have it last year when they nested in the courtyard. I'm perplexed as to what is happening. Has anyone ever encountered this? Should I tie up the streamers on sparrow spooker or take it down to see if he returns? I'm just afraid that once the babies hatch, she'll be on her on. I keep thinking, "No, of course he'll be there with her, but why isn't he with her right now when he always has been?" Like I said, I saw him twice today, but completely ignoring her & the nesting site. Please help! Very concerned! Nicole