Hi Jeff,
I believe the answer for me would depend on doing with it in your collection.
If you want to display it where you could look at it, I would consider carefully sliding it open into a one pocket Ultra Pro page. This would be my personal choice. If you're not going to display it, slide it in it's current folded state into a one pocket page with archival white cardboard. The other alternative would be to store it folded in a photo top loader.
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