The most I've ever received in a single carton was two, but they were jumbo sized eggs, so depending on the farm you get them from, that's not all that unusual. The odds of two double yolks in a single carton can be as high as 1 in 1,111 given the right circumstances, so rare but hardly unheard of if you eat a lot of eggs. I've bought a lot of cartons of jumbo eggs with one double yolk before.
An entire carton of them was likely due to a labeling or sorting mixup at the farm they were sourced from. I've also heard that some farms occasionally ship out all double-yolk egg cartons without labeling them as such, which again would technically qualify as "unlabeled."
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u/CoolWhipMonkey Dec 18 '22
I accidentally got an entire carton of double yolks from the regular old eggs I always buy at the grocery store. I was pretty tickled by it.