Those look like they might be for the integral film photos, the 600 and SX 70, but I can't tell for sure from the picture (would need to measure and see). I'm just getting started with the peel apart film and don't have enough to store yet.
I was thinking I'd maybe try small photo storage boxes that someplace like Lumiere in Rochester carries, or I might try a small scrapbook and photo corners. I've found some older Print File pages still in the original packaging, or even a vintage photo album to hold the integral size prints, but not anything much for the pack film photos.
You might try the Pittsburgh Photo Exchange, I think they have two locations, one that sells new equipment and one that has all kinds of vintage items; they sell on eBay and have their own website and I've gotten some nice used items from them.