While the Launchbox database isn't tied, per se, to the No-Intro naming scheme, I have found if you start with a set of games that are already named per the No-Intro database, you will have much better coverage when Launchbox tries to download media.
I just created a new DS platform and told Launchbox to download box - 3d, box - front, cart - front images, screenshot - game title and clear logos. This started from a No-Intro DS set consisting of 1563 titles. This was only from the Launchbox database and didn't include anything from EmuMovies. Edit: I added EmuMovies and those totals are in parentheses.
Here is a count of the number and type of files downloaded.
Box - 3D: 1545 (w/EmuMovies, 1554)
Box - Front: 1546 (w/EmuMovies, 1554)
Cart - Front: 1421 (w/EmuMovies, 1439)
Screenshot - Game Title: 1326
Clear Logo: 1526 (w/EmuMovies, 1553)
As you can see, I got nearly full coverage. The only ones with missing media were the multi-game carts and a few homebrew that aren't official anyway, although there were a couple I had to manually tweak in the Edit Game panel to force a match.
If you want to see what is contained in the LaunchBox database for a particular platform, the easiest way is to make sure LaunchBox and/or BigBox are not running, then use a SQLite editor to open the LaunchBox.Metadata.db file found in the Metadata folder. You can perform a select statement for the platform in question for any or all the fields in the database. Make sure you only perform a read-only query and don't change anything while accessing that file.