Preheat oven to 400 degrees. Roll a sheet of pastry lightly to fit sides and bottom and cut to overlap 1/2 inch on top of Brie. Brush 1/2 inch of pastry rim with water. Roll second sheet lightly and use top of Brie box to cut dough to fit exactly on top. Place on top, using fork to press down and seal edges. Cut out leaves, flowers, or other shapes with any leftover pie crust and decorate top. Mix egg with a little water and brush top. Bake 25 minutes, or until crust is golden brown. Wait 45 minutes to an hour before serving. Cut into thin wedges. Serve surrounded with crackers.