That's why I said "if everything the OP says is true", as I know not being privy to the buyer's side of the story, the exact content of the messages etc, can sometimes mean we don't get the full picture, and why I said if the buyer never claimed the goods were broken (other than in FB). 

The OP mentioned that they put the picture in the listing after a few queries, but the buyer bought at the end of December, and the last revision to that listing (which was to the BIN price according to the revision details) occurred in July, so the listing as it is now is the listing the buyer would have viewed AFAIK. 

I do think it would be better to only show the pencil in the image, despite the item title being quite clear. I would probably change "complete assembled unit" too, to something more specific  which leaves no room for doubt, as that image couple with that phrasing does have the potential to cause confusion, but I was trying to address the OP's question and provide advice in relation to the information given, which I have no choice but to take at face value.