magiclibrarities.net's Friday Night Magic Promos page states the following:
So I guess the FNM page kinda mentions this but it seems like a hyperlink to the wizards.com link might be useful. It also seems like it might be worthwhile to mention the fact that Crystalline Sliver's, although intended for FNM release, weren't ever actually released as part of an FNM.In 2003, the prize card for March, a foil Crystalline Sliver, was unexpectedly skipped, allegedly because it has been stolen. As an intermediary solution, upcoming prize cards were moved up one month ahead of schedule, but since the new card layout was not supposed to debut before the release of Eighth Edition, the foil alternate art Disenchant was eventually released in July 2003 to fill the gap.
It also seems like the magiclibrarities.net Grand Prix Cards page ought to mention Crystalline Sliver?