Those who attempt to smuggle larger commercial shipments of eggs into the U.S. could face up to $10,000 in fines. On a smaller scale, individuals who try to smuggle eggs into the U.S. could face a fine of around $300. You could avoid these steep fines if you declare your huevos, but the eggs will most likely be confiscated and destroyed, ...
https://www.yahoo.com/now/yes-black-market-eggs-thing-160000165.html
Here are some interesting items I found when searching for "Black Market Eggs":
Black Market Eggs (aka eggs from a market)
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Black Market Laying Hens
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Hint: Ayam Cemani: A Rare
Chicken Breed That is Black Inside Out
we mean a Silkie chicken, which is black-pigmented right down to its bones.
https://www.thekitchn.com/whats-the-deal-with-black-chickens-80171