A post on the forum complained of constant "Item Inaccessible" spam. Investigating the save determined that the dwarves were trying to store Olin Cagithmorul's teeth in Stockpile #3, which you can determine by opening the jobs list repeatedly until you see a Store Item in Stockpile job, then using 'j' for details on that job. The teeth in question are on z-level -77 in an unrevealed part of the second cavern.

http://www.bay12forums.com/smf/index.php?topic=161506.0