You're actually kind of lucky. I bought duck and goose eggs last year and had great hatch rates so I decided to try chicken eggs this year. Multiple batches. Each batch was incubated with two of my own barnyard mix. All of the BYM hatched but one. So far none of the shipped eggs has hatched. Here's what I dealt with.
À batch of 10 Easter Eggers that were rotten, the first one exploded two days after going into the incubator. All of them either developed the stink or exploded.
6+ Bresse eggs that were actually 5 eggs that looked like Wellsummers. They were packed in sawdust with no bubble wrap or foam. Possibly due to shipping but more likely because they were as fertile as they were Bresse, none of them showed any development at all.
Another batch of 12 Easter Eggers the seller shipped 18, 3 broke, and nothing developed.
7 crested cream legbar. Very well packed in foam, no signs of rough handling, but no indication of fertility either, nothing hatched.
I also have 6 more Ancona owed from someone in Florida who hasn't shipped eggs that were ordered two weeks ago. Anyone who needs two weeks to collect and ship 6 fresh eggs seems like another scammer to me.
Currently in the incubators are 3 Ancona chicken eggs out of 14 that were shipped. I was supposed to candle yesterday, but didn't bother. 8 very expensive Bresse eggs out of an order of 10. One of the two that broke during shipping was fertile and I'm hoping it wasn't the only one. And 8 CCL and 4 EE I drove an hour to pick up since I've resolved not to buy any more chicken eggs on
Ebay.
The way egg sales are structured the buyer takes all the risks, and
eBay only gives you 30 days to provide feedback, which isn't enough time to evaluate the eggs. I'm not saying you can't get good eggs on
eBay, but there seem to be quite a few dishonest people selling eggs too. I mean all they have to do is buy a dozen eggs for a few dollars at the grocers, claim they're something they aren't, and sell them for twenty or thirty times what they were bought for. The buyer pays the shipping, the eggs probably won't hatch, and the seller pockets a tidy profit. You don't need to be NPIP or even have chickens.
At least you have some new genes in your flock. .