So I accidentally bought a Golden Goose Egg (Grade B).
Turns out, the egg doesn't get used up when you double click it (akin to the RED Treasure Chest event). Lasts for 7 days, and like the event says, only one Golden Goose Egg can be opened per day.
Still peeved that I accidentally bought it, but it's nice to know that they're not one-use.
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