The thing about shipping stress is it can sometimes be delayed. You can carefully pick out the liveliest chicks from the chick tank at the store, they can be perfectly fine when you get them home, and the next day, you will suddenly see one doing the droopy act.
The best practice is to dose each chick as soon as you get them home with a few drops of Nutri-drench and dip every beak in warm water. During the first few day, only warm water should be given, and the second you see a chick slow down, drop its wings, nod off standing up, treat with warm sugar water.
And as @EggSighted4Life mentioned, chicks need to be with the other chicks, even sickly ones. I had a failure-to-thrive chick (FTT) that was half the size of the others and required special food. I left the sick chick with the other chicks and fed them ALL the special food. This enabled the sick chick to learn to be competitive instead of withdrawn, and it would squeeze in under the legs of the other chicks and end up in the middle of the dish of food getting all it needed and then some.
The best practice is to dose each chick as soon as you get them home with a few drops of Nutri-drench and dip every beak in warm water. During the first few day, only warm water should be given, and the second you see a chick slow down, drop its wings, nod off standing up, treat with warm sugar water.
And as @EggSighted4Life mentioned, chicks need to be with the other chicks, even sickly ones. I had a failure-to-thrive chick (FTT) that was half the size of the others and required special food. I left the sick chick with the other chicks and fed them ALL the special food. This enabled the sick chick to learn to be competitive instead of withdrawn, and it would squeeze in under the legs of the other chicks and end up in the middle of the dish of food getting all it needed and then some.