I wouldn't hold out hope on NW. From the luggage rules:
Northwest, like most major airlines, assumes no liability for loss of, or damage to: Antiques / Computer Equipment and related items / Documents (personal or business, negotiable papers) / Electronic Equipment / film /
Jewelry/Watches / Keys / Manuscripts / Medication / Money / Paintings or one of a kind works of art / Pets/Animals / Photographs / Photographic Equipment / Samples / Securities / Silverware / Fragile Items / Irreplaceable or Perishable Items.
Sorry.
