Wedgwood Jasperware Egg shaped box

I found a nice box to add to my collection of Wedgwood Jasperware Eggs. This little box has a wren on it and is dated 1981. I do already have this box, but I was never quite happy with it as the base doesn't fit properly. Looking closely at the pair, the wren's have been applied at different angles, and the inside of the dodgy box has a green blob on it, which means it's a second! The last picture shows my other egg boxes.