I got hacked... Barely..

Maybe you accidentally npc'd it and thought you were putting it in storage..

I know someone that did that with an 11 attack glove once.. I npc'd a few stacks of ores that way when I was half asleep too..

That is what I was gonna say, and is probably what happened. I NPCd like 6 scrolls and never knew it til I tried to retrieve them with my mule from storage and they weren't there, lol. Anyway, good luck getting another.