Disc creation date seems to be 24th April 2001, and the press disc contains:
*7 High res .PSD artwork files with multiple layers, 4 Antitoon renders and 3 Rayman renders (unsure if 2 of the Rayman ones are Advance related or generic Rayman renders of the time, or if they're additionally dupes from another existing Press Kit).
*Near finalized PAL Boxart .PSD file with full separated layers (down to every last detail!) + a .JPG 3D render of the PAL boxart.
*Game Logo .PSD file (not absolutely huge res but it's solid quality and has a transparant background).
*13 screenshots.
*2 Developer photos.
*A Project Manager Q&A document (which comes in both English and French) and a Preview Guide document (featuring listed cheat codes for the journalists lol).
Download Link (Disc Image in BIN/CUE format so you'll need to mount it): https://archive.org/details/rayman-advance-press-kit
Hopefully at least some of the material contained here is new / an upgrade on what you previously had for Advance, and can help fill out the wiki or other related Rayman sites with new material! (or at the very least make dumb edits with the PSD files, like this poor Antitoon who has lost his limbs



