*plays rimshot*
Sucks that it happened but not much else you can probably do besides file a complaint or something. I mean he obviously didn't comprehend that you traded an item for the gil given to you. If he understood than he should have just taken the gil from you, given your item back that he should have taken from the guy, and given the money back to the original owner and all would be squared away. Losing 1.9m because someone else stole it is rather...screwed up to say the least.