This is a strange one for me...

[Coop de Grille]

The possible parents could be white Ameraucana, white EE, or this guy, also an EE:
These are my EE's:



This is an older pic, it's the only one I can find of him at the moment. He is a lot bigger now.






Then I have a pure white EE and two pure white Ameraucana.

 

[PotterWatch]

I would ask your family/ friends if anyone dropped off a couple chicks without your knowledge. It would be an amazing stretch to get two birds that look exactly like brown leghorns from an EE flock.

 

[Coop de Grille]

Mystery solved! I was commenting to my husband about this and he reminded me that he bought 6 "red pullets" from Tractor Supply. I totally forgotten about that. (I have over 60 chickens, easy to forget!) I had a hatch that only had one chick and it was chick week. He brought them home to keep the little guy company. TSC must have mixed them up although I don't remember them ever having Leghorns in their bins.

 

[PotterWatch]

Well that makes sense! I had a similar thing happen here when a friend brought over some chicks that hatched at her child's school and my husband neglected to tell me about them. I was really confused trying to figure out where three extra chicks had come from when I noticed them a couple days later.

 

[Coop de Grille]

I guess I should be expecting white eggs anytime now, huh? All my chickens are brown, blue and green egg layers.

 

[Coop de Grille]

I guess they are in fact Brown Leghorns. I got my first white egg today!