I had listed an item for sale on my Guild Store. After I put it up I realized the price was probably too high so I removed the listing. But now the item is nowhere to be found! While I couldn't care less about this specific incident (it was just a Pumpkin), I can only imagine this happening to someone trying to sell a Racial Motif or a Legendary piece of armor. That would be a nightmare.
And yes, I checked my mail, my bank, and my character's inventory. I had open slots in both my bank and inventory upon removing the listing. Just figured I'd make sure this was a known issue before people start losing valuable items.