Actually I did. I created a newbie, got em level 5 and got 99% steal. In the blacksmith's inventory was the receipt and no matter how many times I tried helping him let go of the ticket, it always failed.
A few hours later though, a kind Immortal helped me and had the Blacksmith drop the receipt. (Thanks again!)
Fairly certain steal is level based (your level vs the target's level). Master blacksmith mobs are probably pretty high level, so a level 5 won't have much of a chance of stealing the ticket afaik. Could be wrong though, could just be like a shopkeeper where you simply can't steal from them no matter how many times you try I think.