Update: Thank you for the suggestions. We ended up doing a little of everything. We blocked the line of sight to the egg box hatch with a hanging towel, put a cinderblock weight on top of the outside hatch. We also put out fake plastic eggs out in the yard and let them steal a fake egg so that...
Thanks, in addition to sitting out this morning with Airsoft guns and peppering fake eggs:)) we also hung a towel from the eave and draped it over the egg box where they've been breaking in. I think your theory of obstructing line of sight might be right because I happened to have the entrance...
We just found out that at least 2 ravens are stealing our eggs on a daily basis. I looked online for tried and true remedies but didn't find anything definitive other than one post that said a lady used a rat trap with a fake egg taped to it. I don't want to accidentally catch either of these...