Just a quick check shows
. my archive osf1src10 contains OSC* as tar files, osf1src20 contains similar filenames but as gzipped tar files.
For osf1src10 untarring all gives a directory ./usr/opt with subdirectories OSC200 and OSCX200.
A quick check on osf1src10 gives mxr, libmxr.so and mxr.1 but no source of those.
For osf1src20 same result.
On osf1src10 the OSC* files have date 2003-11-03, on osf1src20 2004-11-06. Unzipped, untarred the usr directory has size 370Mb. A quick check shows my osf1src10 and osf1src20 contain the SAME software. Using "ls -lR" most source files seem from 1994-03-02, but there are groups from 1993-01-26 as well (e.g. termcap files).
That's all from me.
The more I learn the better I understand I know nothing.