I had a legacy dwarven waraxe, but it wasn't from a published adventure (it was Moradin's Grip from an RPGA adventure).
I know of two published legacy warhammers, Bloodcrier's Hammer and Whelm, and lots of published legacy swords.
If you want a shortcut to building your own legacy dwarven waraxe, you might use the Ancestor weapons from Races of Stone or the Axe of the Dwarven Lords from the epic handbook for background story and then convert one of the legacy swords or hammers to a dwarven waraxe for gameplay stats.