First, a mysterious copper coin, and now a mysterious silver coin has appeared in our Adventure Guides, but what could it mean?
Since the Dragonflight pre-patch, if you scroll all the way to the end of your And you’ll find the following page:
“There appears to be a single copper coin tucked into your Adventure Guide.”
Picking up the coin (by pressing the button that says “Sweet, free money!”) starts the quest A Piece of Copper, which rewards the achievement Lucky Penny.