I'm a strong believer that regardless of what the eggs look like it's often "what will be, will be" but the chances of a successful hatch are always higher when the eggs are fresher and they were already delayed by being in the mail so while I did allow my eggs to rest, I waited about 6 hours. 8 to 24 hours is recommended.
Another thing I commonly see is people putting them in the incubator and not turning them for a period of time. There are lots of studies showing that the first 7 days are actually the most important days to turn the eggs so I always put them in the turner...I also use my horizontal turners, lol.
....so I basically went against just about everything I've ever read about shipped eggs, LOL! I had scrambled eggs that had zero development but only 1 actually quitter in the batch that I did as I pleased. Maybe I just got lucky but I'm going to do it again and monitor it much more closely from a few sources so I can say with more confidence what I feel works best.