Ok, we have had some mishaps with the white faced blue Spanish eggs due to what appears to be an issue with the post office using the box for goal-kicking practice.
Another egg that had a slight crack in it exploded in the bator tonight. We got it fairly early, so I think we were able to save the rest. It looks like we are down to 8 white faced Blue Spanish, and there's also a Black Spanish egg that looks like it might have a slight crack in it--might as well get rid of it now before it creates a problem later.