I sure don't trust USPS after all the horror stories I've read on here. But then, I've never bought eggs
The batch I had delivered to my house had some bad air cells but the one I picked up at the post office looked great and actually developed great up to lockdown. Not sure why those haven't hatched yet...Going to investigate when I get home. I did set the temp a degree lower than last time because I thought my incubator was running hot, so they could just be late...