Sheesh - things fly by when one doesn't pay attention...
Felipe - I have been keeping them in this nice little cardboard box that I found at work. A Mitutoyo caliper came in it, and it is perfect. I have two. Danged if I know what I will do when they are full.
I have been looking for an "archival" box but have not been able to find anything that fit well.... I keep looking.
But I really like the sleeves better than the pages. I tried them for a while & they just didn't fit my style.