Yes, the proper procedure. Thanks for not being offended by the question.
If they were shipped the 28th, they were hatched the 27th. If you received them the 31st, they were four days old. I’ve had a broody hen wait that long to take the first hatchers off the nest, waiting for the late ones to hatch, and those chick were fine. But that’s getting close to the limit as to how long the absorbed yolk will provide food and water. They could have been a bit stressed by that so resistance dropped.
I’ve had shipped chicks delivered he day after they were shipped, overnight, but most of the time they come the following day. I’ve never had a chick arrive DOA but I have had a chick die three days later. Sometimes they are just not meant to live. I’ve never had a problem where several continue to die.
My guess is that they were probably exposed to too much cold during shipping, maybe left on the shipping dock too long. That and the longer than normal shipping probably weakened them. Probably not Meyer’s fault, but still call them and see what they offer to rectify the problem.
The post office ships chicks by different routes, depending on where the hatchery is. Next time you might look at different hatcheries and try to find out what routes the post office would ship to cut transit time. Not sure how you’d check that, maybe chat with the hatchery.
Next time you might try putting a little sugar in their first water, just the first 12 hours or so. Or you can buy electrolyte packs for that at the feed store. I’ve never done that but it will give them a boost of energy to help them get over shipping stress. I did that with an injured hen one time and she perked right up. You could still try that, just don’t leave the sugar water in there long enough to go sour.
Another thing to avoid is ordering chicks around the holidays, any postal holiday. Although they insist it doesn’t reduce transit times, I think it does. Posts like yours show up more often around postal holidays than other times.
That’s a rotten introduction to shipped chicks. Usually it’s not bad at all.