Solar Artifacts
People on the White Wolf forums posed questions asking where the mighty First Age Solar Artifacts had gone. The contention was that they seem to be missing from the tombs people most commonly raid.
One idea I put forth is this musing:
Perhaps the greatest Artifacts, those which the Sidereals and Dragon-Blooded could not safely use, were sacrificed to the Unconquered Sun to appease him for killing his favorite children? Sure he wasn't currently paying attention to them anyway, but better to hedge your bets.
Totally an unofficial musing there...