I don't know how old your girls are, but I have one who has just started laying, though it might be two, but I think it's just the BR. Anyway, Friday night I found the first 2 eggs since we got them in May! And haven't seen an egg in the last 2 days... We just went out to take a peek and see if anything had happened and my SO found 2 eggs in a 6 inch gap on the roof of the coop! Check all the "normal" hiding spots, then start looking in the truly weird ones! They may have just found a better hiding spot, lol.