While your boxes are older and not available new anymore, they are far from antique. There really aren't that many serious shotshell box collectors, but I will forward your posting to a few I know and see if there's any response.
Best.
I would sugest you go to ebay and watch the sales of the ones that are listed there and see if they even sell. If I had those I would use them to organize my loads.
Uh, Oh.
You might just have called me an antique.
Quite a few of those are still residing in my ammo boxes.
And I didn't think of them as old, even.
Until now.