RyanGi : There are actually four of those pieces...

This little 'gallery' (or what I think of as a riser) indexes the box lid to the bottom, and the 'scallopping' is there not only for looks but also to diffuse any suction that might develop when the lid is removed...
Thanks Barb!

Mike, in Concord, NH - A candle loses none of its flame by lighting another candle...