[butterdezillion]

Here's a larger, clearer photo of the Diocese photo (cropped):

[ConstantSkeptic]

I don't agree with the lines you drew. My lines, below, make much more sense.

I have outlined the top of the base, and the bottom of the lid. In addition, I have outlined where the puffy-liner which follows the inside edge of the lid meets the smooth top liner of the lid. You can see where the cloth drapes over the rear left hinge of the lid.