Missing Horcrux in the Room of Requirement?

Tue Aug 9 01:56:05 UTC 2005

No: HPFGUIDX 137000

JKR certainly leaves this open to consideration in Book 6, by 
discussing all of the many, many old items stored there besides the 
Advanced potions book stowed away there by Harry, and the cabinet that 
Draco repairs! I think Harry will be back there in book 7 to fetch the 
potions book, and perhaps stumble across a Horcrux placed there by 
Voldemort earlier! Any thoughts on this?

Jim