I had someone plant a Myrland rose in my backpack back in MO1 in 2014 while I had my back turned banking my stuff. By the time I saw the message that someone had done that, the person had run off and to this day I still don't know who it was.Other fun things to do as a Thief was to steal the enemy mage reagents on the battle field so they could not cast any more spells, lol...
What else was there, oh you could also use the skill to plant things on people too, so if you could catch a guy outside of town and put something illegal into his pockets you could then follow them into town and take their stuff once a guard killed them, lol...
Thievery wasn't just for thieves, it was for everyone who had other intentions in mind.