As far as real elephant swords go I saw something on Discovery channel or history channel two months ago about the Mughals and the elephants were fitted on there tusks with some type nasty sword object I really can't see a sword being swung by the trunk in that way.
http://www.amazon.com/Warrior-Empire.../dp/B000H5U5SU
Lew
Btw
The seller states.
According to an expert in the SE arms & armor this is an elephants sword made for an elephant.
So in this statement he has laid claim to it's authenticity.