Rob D. - Beautiful picture!
My father-in-law makes these boxes. Nothing is available right now.
http://www.dakotawoodcrafts.com
He's sold about 2 dozen of those 'T206' boxes and 2 dozen 'Graded Card' boxes to date. Currently he is designing a similar box to hold standard sized (3x4in) top loaders. Probably hold about 3-400 cards. I will be looking at a prototype later this week. When they are available - look for a post on Net54!