Nancy Drew: Tomb of the Lost Queen Easter Egg - 2 Easter Eggs Literally.

When in the Antiques Tent, pick up the tools on one of the tables. Look for the vase at the back of the tent and use the hammer to smash it, once you've done that you should hear a chicken noise followed by the egg! Later, towards the end of the game when you are playing the mouse weighing puzzle put the egg in the opening where you put the lightest mouse. the original egg should pop out followed by a golden egg. Having both these eggs when you finished game will result in you getting a check labeled "easter eggs" at the end of game achievements.