I was poking around on the Wacky Package forum and found a posting about a Heritage auction consignment from a long time Topps employee from the Duryea plant in Pennsylvania. Most of the boxes are baseball but I spot three 1966 Batman boxes and a 1966 Get Smart too! I believe that one of the Batman boxes is the one currently being auctioned by Heritage (ending toward the end of February 2024).
I cropped one of the pictures (below). If you click on it, it will take you to the Wacky package forum page!
The auction picture of the Batman cello box is below and will take you to the actual auction.
It will be fun to see the other boxes put up for auction!