Thank you, bbroussard. But today, the DiscSox CDPro Sleeves came in, and they will do the job. They are exactly the same size as the Jewelsleeves, and hold the same things in the same way. Including the tab at the top, which allows a label to be inserted, and therefore, the file cabinet will work with them.
They don't seem quite as sturdy, but I don't throw them across the room, so I bet they'll hold up just fine.
Thank you all for your suggestions. I didn't really expect a happy ending, but this is a good resolution.
By the way, a company called Swift River Wood Products made what they called "Jewel-Chests." I got a four drawer set that holds over 1,000 CDs, and takes up very little space. These DiscSox CD Pro sleeves will also fit. If any of you are trying to find a way to condense the footprint of your CD collection, I highly recommend the Jewel-Chest, to use with the DiscSox sleeves.
David