I incubate shipped eggs all the time. I used to let them sit as recommended, but that doesn't always work as far as reattaching the air cells. What I do now is set right away after I candle for cracks & broken air cells. I'll mark the rolling air cell eggs & set them anyway because they can still hatch. I always stand my eggs upright (on pointy end) because I can fit more in that way. I just don't turn the incubator for a day or two. The way I see it is they are already compromised from the shipping process. Why let them sit on the counter and get older as well? Once I started setting right away, my hatch rate increased. I also wash & sanitize my eggs & that improved my hatch rate as well. Last hatch was 79% from shipped! I've had as high as 85% from shipped, but only from backyard mixes, not pure breeds.