The demo came with issue 88 of the French magazine Joypad. It came in a thin jewelcase without insert, sealed in with the magazine and a guide booklet to Resident Evil 2. A sticker on the front of the magazine advertised the demo.
The disc was also published in Australia with a sleeve, and it may also have been given out by PlayStation Plus in the UK as part of a phone-in campaign advertised in the magazine.
The disc contains the second PAL demo, which is a later build than the demo which came with Metal Gear Solid in Europe. The same demo is also available on Best Horror Games Ever Demo (UK, Italy, Poland, Spain, and Australia), PlayStation Zone CD Vol. 10, Germany Speziale 11/99, and Official UK PlayStation Magazine Disc 103.
1. Front of magazine with demo, guide, and sticker
2. Back of magazine
3. Disc
Thanks to eBay member retroverslefutur (images 1-2).