I can't spot it, unless you mean the "custom_box" but i tried using them and it had horrible join line everywhere.
i haven't used these fonts yet because i don't have the boxes but i have installed different fonts before. Just go into the fonts folder, right click on the one you want, probably all of them to see what they look like, select install and then re-open gimp/photoshop or whatever you are using and they should then appear in you list of fonts to write with.
If you do figure out which font is which then please say : )