Item gone missing?

So a few hours ago, I was selling a Lux Cherubim and a few other items in my store permit. About an hour after I had opened the store, I closed it and logged out. A few minutes ago, I went back on my store account, and I was setting up shop for the night and I find that my Lux Cherubim is missing. I only have a few million in my inventory so I know it didn't sell or that I didn't misprice it because someone had offered 1b for it. It is the only item missing in my inventory that I can tell. I didn't equip it, it wasn't sold, I didn't store it in the CS inventory. I'm lost.. I guess I'm going to have to write a ticket to Nexon or something. I have no idea where that item went. Is it possible that the item was sold as I closed the client and the mesos didn't transfer? Ahh... don't know what happened..