Doh!...I meant the Earth Crystal!(thought, Wind Crystal was 4ourth...!

But...wrong!
There is more than 1 ThiefGlove!

You can find 1 in the Steanmship in world 1.
In world 3, you can steal 1 from "Secreto"(Brother of Minotaurus in the Pyramid!, its the rare Item to steal)
, and you can get 1 by stealing from Necrophobe
(Last Boss before Xdeath, but you steal mostly a Elixir!)