Eggs aren't common for all users I think. There's a 1/25 chance for an egg that's seen by one user to be a common-shared egg I believe!
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Found an egg here on my old comment: (you need an account to see links)
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Got another egg here on Nataur's comment (bottom of page): https://clraik.com/forum/showthread.php?80983-Neopets-Down-For-Maintenance-Wednesday-March-23rd/page3