Mine start about 6 months old and yes they lay in nest boxes. However, some of mine lay eggs almost the size of a RIR.. and some are tinted and look almost like a brown egg.. Are yours bantams?
I dont know if mine are bantams. They are about half the size of my chickens (RIR, BR, Orp, Maran, etc) but I thought that was just the size of a Phoenix. The gentleman who gave them to me ordered a large number of
birds last spring and didn't really know what was what.
Could some of you post pictures of your Phoenix eggs? I got a small egg two days ago but it was brown so I assumed it was a "hiccup" from another bird. It is definitely brown, and not white at all.
I tried to post a picture from my phone yesterday, but it didn't work and I lost my whole post. Maybe I will try when I can get on my actual computer.