You provided new information while I was typing. It sounds like shipping stress if it took five days. Call the hatchery and tell them what happened. They probably have a policy to cover this. Once they leave the hatchery it is on the carrier, post office or airline they use for shipping, but the hatchery will often try to help.
My suggestion is to use a medicine dropper and put some energy and liquid in the remaining chicks. I use hummingbird liquid but sugar water can work really well. You can buy stuff with electrolytes if you have time, but you don't have time to spare.
Put a drop on the tip of the beak and let them swallow it, don't drown them by forcing it down their throat. Good luck, this is rough.
My suggestion is to use a medicine dropper and put some energy and liquid in the remaining chicks. I use hummingbird liquid but sugar water can work really well. You can buy stuff with electrolytes if you have time, but you don't have time to spare.
Put a drop on the tip of the beak and let them swallow it, don't drown them by forcing it down their throat. Good luck, this is rough.