x2 Me too! I blame them for much of the problems here.
1. up to 10 days in cool storage is fine. I store mine in carton wide end/ air cell up and
turn them a few times per day. (One side of carton elevated, then rotate which side is elevated)
2. You can always crack one of the eggs and check for fertility. Otherwise you'll have to wait about a week of incubation to candle and find out that way.
3. Look at the surface area of the hen's pancaked spread. How many eggs can fit on a plate that size? That will be her egg capacity. If not all are developing in a week, remove the clear ones.