Oh, I believe you. It makes the most sense in my case. I doubt it's the construction, or I'd be finding tiny eggs all the time. I know it isn't a diet issue because mine are turned out to pasture and I give them chicken feed as well. Plus, none of the hens are displaying any health or behavioral problems. I know it's not a parasite issue because they've been treated. It wasn't a cowbird egg because it didn't look like one when I compared the two. None of my birds are too old to lay eggs, so it can't be that either. I have three first timers though, so I think you're right. I haven't seen another tiny egg since then.
First of all, I want to excuse with you all for the time of absence, I had some problems...
Anyway, I have good news: I talked with my gramparents about it. I asked them about the tiny egg and they told me exactly what I told you in this forum. Then I asked them for the possibility of this egg for being without nucleus, and my grampa began to tell me there is the possibility to find a very very tiny core as well as the possibility not to find anything...
I nearly forgot: my gramma stated that there isn't the possibily to find an egg without the nucleus, whereas my grampa told me maybe there is the possibily to find it.
To sum up, I don't know exactly since this is the first time for me and for my family to hear this.