I had 2 of the same eggs. One of which I needed to send to a friend.They were both fresh.
I couldn't tell the difference at all.
By chance, I clicked on one and it showed me that it was her egg (since it was picked up latest).
(^it's an image, guys)
:D
Oh, found it sort of funny that it pointed out that it can be hatched at the Hatchery. xD