It happened to me a couple days ago. I was upgrading an item for a friend, and I had no way of telling which of the unupgraded items in my inventory was his and which was my soulbound stuff. I accidentally upgraded the Glocked item. No biggy, it was a free-to-subscribers upgrade.
This evening, one of the donors for the Interior Design contest had the same thing happen, but in this case it was a 25 credit item.
It would be really really helpful if Glocked items could be distinguished in some manner. Some of us have no desire to place certain of those inventory items in our homes, but do craft them and give them as gifts. It's far too easy to spend credits accidentally.