Is it a case of the cables having been terminated at this end, randomly? And then labelled at the far end? How could one possibly get them to look that good, and also be in the correct order?
While I've never done a project nearly that large, my larger ones (typically 100-200 cables max.) were usually marked/taped together in sets of six cables as they were being pulled. This was pretty easy to do as the reels/boxes were set up in groups of six. Since the patch panels we were using had the blocks configured in groups of six, dressing it up wasn't too difficult to do. One guy that I worked with actually made us throw in one odd color per six cables as a 'racing stripe' so that our lacing skills could be quickly critiqued and redone.
We also made it a point to keep the cable length to an absolute minimum, as in within a foot or two of termination. This saved a bunch of sorting time. Lastly, keeping them loosely bundled in groups of six with backward electrical tape made it easy to keep it as 'sortable' as possible when termination time came.
After the cables left the room and into the closed ceiling spaces, it was anything goes. Yes, we even did stoop as low as not following any fixed location numbering order at the station end if it meant that the switch room looked perfect. As long as the jacks were properly labeled, nobody complained.