You outbid me on the 67 hole board! I got the other big one.
The magic square was interesting. I've seen a few 3x3's, I even have one. The last one that sold on Ebay was in England and sold for almost $1,000 with the 9 marbles. I can only think of a couple of 4x4s I've ever seen, and I've never seen one with the complete set of marbles.
I was surprised at the lutz prices. They've been soft lately, and most of these were anything but soft, especially considering the number of lutzes they had. But you're right, it's hard to bid the big bucks if you can't see them in hand.