Well, you may have more success with your shipped eggs than mine.
I couldn't wait any longer & candled Friday morning.
I lost count of how many were clear. Out of 47 eggs set, there's only about 7 that are veining, with a few more ?-able ones.
And I've incubated eggs before, so I know what they should look like on day 7.
I'm pretty sure they were just infertile, as those eggs were from before I had separated the hens and roosters into breeding groups.
So, while I've rotated roosters throughout the winter, the ratio was around 1 roo to 35+ hens (have 40 currently, but some are younger or not laying).
Now, I've separated them, so there's a better ratio of roosters to hens, but with this cold weather I'm not sure if the roosters feel "springy" enough to do their job.
I was able to get one egg yesterday morning that was still warm in the nest, so I brought it inside, and put it in the incubator last night.
I wasn't home during the day yesterday, so the rest of the eggs froze solid.

I'm hoping to collect a few more today and replace the ones that are clear.