Got to this step & killed 12 of the Swordfuries & then after killing the 13th one the quest wouldn't update. I relogged & the same issue. Deleted the quest & started over. When I got to the part about killing the Swordfuries, killed the first one & the quest wouldn't update. I will submit a bug report. Well I deleted the quest waited overnight & tried the quest today & was able to complete with no issues.
https://forums.daybreakgames.com/eq2/index.php?threads/quest-wont-update-eafrygia-music-box.608119/ A fix for this confusing situation is instore! Keep an eye out for the following change listed in the update notes to know when it goes live: All Renewal of Ro "Music Box" quests - Finding the music box keys update should now recognize the proper key even if it is already in your inventory, when the corresponding key quest has been completed, no matter what zone you are in at the time. ~ Kaitheel
