I finally got around to looking at them, and they are libiconv shared objects.
This is most likely an error in packaging of bos.rte.iconv.
The ones inside of /usr/lib/libiconv.a are from 2010 (220.127.116.11),
but the ones in / are from 2011 (18.104.22.168)
It's rare to run into NLS problems, so it's not been worth the hassle of calling in.
I typically leave them there, in case there is a real reason, or if IBM fixes/cleans them up in a future PTF.