It was, up to now, possible that if you got your instument destructed (such as
by reincarnating with your instrument in your inventory) that it was
permanently lost (by first showing in the lists but being unavailable).
This has now been fixed. What happens now is that when you enter the rack
room, the code checks if you have misplaced your instrument in some peculiar
way, and if yes, reloads it in your inventory. It even gives a cool message
when this happens, haw haw.
Rgds, your friendly neighbourhood Wizard