I understand that the files on the disc label this disc as a beta, but I purchased this myself at retail back when it came out. I have attached an image with the box and contents.
This definitely came from a retail release of the game. It seems to me that labeling it Category: Preproduction and Edition: Beta is inaccurate in this case.
Sony did release an actual Phase 4 beta disc. The disc looks like this https://archive.org/details/EverQuestUSAPhase4Beta and matches this submission http://redump.org/disc/54994/