I think they must have had a rough journey and that it's not your fault. Having that many DOA is a bad deal.... I agree with Chicken Woman...if they want to replace your shipment hold off for a month or so, just to be safe.
Fresh water with vitamins, starter feed, clean bedding and maybe a snitch warmer if you can do it... I keep them very warm that first week after they hatch.
Are they in a draft free place? I put mine in the deep bathtub, so there isn't a draft.
I hope the rest of them thrive for you!!!
Hugs!