Got my cases today from Shadowfox in person. These are great! As I was moving my inserts around, I couldn't easily tell them apart from the official DS cases. Quality is very good (out of the 50 I got only one had a minor issue with a clip that could be easily remedied). Some of them did require a little force to get open the first time, but nothing major. Manual section is great I could easily fit all adverts and precaution manuals into them with the original game manual. Just be careful when putting manuals in, it would be best to lift up the clips before putting the manuals in otherwise it is very easy to rip them. Overall though, highly satisfied with them. No more having to chop up DS cases, and being able to add all the manuals with them gives them that more heavy complete feeling (that sadly is lacking on modern games). Will definitely be buying more from him in the future.
Now when can we see double-wide cases for rumble carts and other wide ones like WarioWare Twisted?
And to chime in with the above, definitely stay away from Media Mail for these. It is listed right on the USPS website that video games (especially just empty cases) are NOT Media. They have been cracking down on it since a lot of people just see it as cheap shipping for anything. Just spend the extra few bucks and send it through Parcel/Priority/Fedex, these aren't that heavy. Also it will be a lot quicker, media mail usually takes a few weeks (and that's without it being stopped, opened, inspected, and held at the post office for the receiver to come by and pay the difference) vs a few days-week max.