You're welcome.
Wow! That's a lot of DS cases. I'm so happy you can use my covers.
The better thing about using 3DS cases is not only do they take up less shelf space but they don't require modification. You can fit all three types of Game Boy games in them. All you have to do is put foam tape in them to hold the game in place. I get my rolls of foam tape from Lowe's but you can also buy them at The Home Depot. The only games that won't fit are the special shaped games like Pokemon Pinball and Star Wars Episode I Racer. Manuals also fit perfectly in them and lay flat unlike the DS cases that have a line of plastic on the left side that keeps manuals from laying perfectly flat.