You can steal Drifter's guitar and he will still act as if he had it. Stupid. Obsidian never checks anything. Since the guitar is so useless, rather than checking if it's been stolen by player, I wrote a tiny script that prevents the player from stealing it. If the player tries, the thief gets what she deserves:
http://i467.photobucket.com/albums/rr40/WRFan/ScreenShot162.jpg
KNOCKDOWN! Yeah, punish da thief!