Should have go and read before I commented; the buyer does not say in his FB he wants full set, he says it broke after 2 days. 

Yes, you make it quite clear it is only a pencil, but why put the whole thing in the main photo?  You really should only have what is on offer; if you do need to illustrate what it belongs with, you can always put the second picture or in the text in description.  The problem ma arise if people buy from their phone and cannot read the description properly.

eBay will most likely remove the NEG though if you have the messages that he demands the full set.