Splintergroup- well, to be honest when I went back to get the pictures for my reply to Steve I had trouble finding the seam. 🧐 😆  The location is further helped by being on the "top edge" if looking at the box.  With the shadow for the chamfer it does "almost" disappear.

Petey- thanks!  And rather than a flaw, this one is more the reality of the raw materials (narrow board). Wish I could say I had fully planned that location for the seam - but happy the joint fell where it did! Plus, I know my project secrets are safe with all of you. 😉