Lina, that pic of the eggs...to me it looks like one duck egg, (shiny) and the other looks like a goose egg. Is the bigger one shiny and waxy? Doesn´t look like it to me.
Vicke, a goose her age isn´t going to lay a very large egg. And ducks can lay enormous eggs. But duck eggs are extremely smooth, almost waxy. Goose eggs are quite rough in comparison. Are you sure the big egg isn´t from a duck?