The other thing to consider is that shipped eggs often have poor hatch rates -- the rough and tumble of shipping can be rough on eggs!
For example, I put 15 eggs in my incubator last year and 5 hatched (I've previously had 90% to 100% hatch rates with non-shipped eggs).
So, I would do as Ridgerunner suggests. Put what is comfortable under your hen, and the rest in the bator. Then, candle everything at day 10 and remove any duds from under the hen or in the incubator. If there are several duds, you can transfer remaining viable eggs in the bator, to the hen, and let her do the rest.
For example, I put 15 eggs in my incubator last year and 5 hatched (I've previously had 90% to 100% hatch rates with non-shipped eggs).
So, I would do as Ridgerunner suggests. Put what is comfortable under your hen, and the rest in the bator. Then, candle everything at day 10 and remove any duds from under the hen or in the incubator. If there are several duds, you can transfer remaining viable eggs in the bator, to the hen, and let her do the rest.