Commercial hatcheries sanitize eggs before they incubate them. One of the solutions that can be used for this, is a 10% chlorine bleach solution. Awhile back, I looked up studies on various substances used to sanitize eggs, and their effect on hatch rates. The bleach solution was one of the best to use, it doesn't reduce the hatch rate.
You can simply wash the eggs with warm water and dish soap, rinse well, and dip them in the bleach solution, and let air dry, before you put them in the 'bator. I have done just that with quite a few eggs, and they hatched fine.
That should reduce the likelihood of contaminating your 'bator, if you want to go ahead and incubate them. If I were doing it, I'd candle at 5 days, and check for signs of life. Normally, I wouldn't start getting rid of questionable eggs until at least day 15, but with the weirdness of the package, I don't know. I'd at least be on the alert for funny smells in the 'bator, and watch for anything growing on the eggs.
Maybe somebody else has encountered something similar this, and might have better insight.
The smell could have been from the box, or packing materials, the eggs may be fine. But that yellow liquid, that's weird. I can't imagine shipping a package of eggs, or anything else, with unidentified liquid, and smelling bad. If they do that often, I bet they don't get much repeat business.
So did the air cells look the right size? If so, the eggs are probably fresh, anyway, whether they're contaminated is another question.
What about trying to get the seller to replace them, at no charge, and they pay the shipping, and try not to send something that smells like a moldy basement?
