Oh, I understand but on the bright side if these are critically endangered chalk this one up to your part in breed preservation!
Hope for a 50% hatch rate, try to buy them as close as you can to your location to keep the shipping times down,
have them shipped on Monday or Tuesday to avoid having them sit over the weekend somewhere.
People advise letting them sit near but not in the incubator from 4 hours to a few days before setting them.
I would recommend 4-8 hours which should be more than enough time for them to settle and stabilize.
Next best advice is ask any and all questions here, someone will surely have something to say.
I've just had a lot of six bresse galoise posted and all six are fertile and wriggling away at day 16 in the incubator
I was sure the post journey would scramble them but they were fine
I sat them ( can't remember which way up) to settle for a day before I incubated them