My interest in the casket is due to the depiction on the front of Wayland the Smith and his brother Egil appears on the lid. The casket is from early 8th century Northumbria and is now housed at the British Museum. Here is a site that discusses the casket with good photos of all sides.
Since sides and portions mirror and complement each other, I am going to go out on a limb and say that the swan/goose on the front panel with the Magi hints that Wayland may have had a swan bride early on.
For those of you who are not familiar with the story of Egil, that is because his story has been taken over by William Tell.