They should still do well. Mama will only lay an egg a day and usually waits until she has a clutch before she seriously, anyway ... so even if you were hatching your own from your own back yard, you'd still have eggs from a day to a week old in one clutch. Somehow, our Magic Mamas can time the whole shebang so that they all hatch around the same day, even if they were laid a week apart. I find that fascinating!33% is amazing seeing they were shipped and all they went through in shipping and being lost, then Summer taking so long to sit!!!!
At this point with my luck with eggs not going through that I would be thrilled to get 33%. Lol. But good to hear they say for 48+ hours and still did well. I have some arriving tomorrow and in order to have them hatch when I am around I can't set them till Mon!!! So around 72 hrs.... But will only be 7 days or less from when they were laid so hopefully will get some to hatch!
Another thing I find fascinating is how a totally inexperienced first-time mom, especially one as ditzy as my little EE, can hatch out a half-dozen littles and immediately become a Super-Mom. Mother Nature and her instincts are wonderful to watch!