Sure would be nice if all the "numbered" icons were labeled. All I can tell you is look at other sets, and go from there. From what I've seen, 32 is generally a folder with a star, or a + sign (no idea what it's for) 36 and 37 seems to have something to do with phones??? 42, and 43 I haven't a clue what they are for. SOmething to do with 'new', and 'copy' .... 

I see sets with a lot of the icons unskinned (default).  Maybe if we could somehow find out what these mystery icons are, we could get Adam to label them in SkS, coz I'm thinking he doesn't know what they are either. 