Guess you've figured out by now that it's become a rare bird you seek. Seems like just a couple of years ago none of us gave the old staggerfeed blind mag boxes a second thought when doing projects. I've got a short action one that I broke one of the tabs on that's sitting in the mag well shimmed into place against the action with some paper because I cant find a replacement.
Good luck on your quest, and sorry I cant be of more help.
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