These are original CDs and printed material from what was originally a bundle that came with an Xserve from what I can tell. I cannot identify an original license key. That's right, I think the license paper that came with these is lost to time. So you are just purchasing the original CDs and paperwork. Please see the photos.

This is Mac OS X Server 10.3 (Panther). The specific version is 10.3.2. 0z691-4616-A 

It says it's the multilingual edition.

The original manual, legalese, and decals are included. Again though there is no license key from what I can tell. Make sure you understand what that means before you buy.