Congratulations on your successfully hatches! I'm in the process of making a homemade incubator in case a bear attacks my coop in the middle of the night and kills my chickens. It's already happened to several of my neighbors so I'm hoping I'll have it finished soon.
The fact that a family members negligence caused this devastating loss is a tragedy! Anyone else would have buried the dead and gave up but not you! You searched until you'd gathered every survivor and even saved the 4 week old!
I've never shipped eggs before but I'd be happy to send you fertile eggs if it helps! If its any consolation I have no one I could entrust my animals with either should I go somewhere for a couple days