What might have happened was, after he traded you the shells and the II, his char might have got rolled back, so that there were 2 of each of the items on the server.
This means that EVEN IF HE DID delete the items, yours would still get deleted. Once u get rolled back and the items duped back, theres no going back. How i know this? cos its happened to me before. i 'duped' an IB because i got a roll back after i traded with someone. i was like shit what i gonna do. In the end it got deleted, and so did the persons who i sold it 2. He was a friend of mine so it was lucky he understood.
Not saying that he DIDNT dupe it, but there is still a possibility he didnt. Also, dupe isnt a problem in KO anymore, ive never had items deleted cos of a dupe wipe or something. Neither has anyone ive talked 2 for a long long time...
So i dont know whats happened here but im saying there is a possibility he isnt telling you something..