I can't seem to find my dead soul, I'm 100% sure I did not sell it

There is no way an item can "disappear". The only way to remove an item from your inventory is to trade it and trading can be tracked by use of transaction history. Your transaction history shows no dead soul item getting transferred. Which means you did not had a dead soul in possession.

I havent traded/sold it, also I did since I participated in the deadly game. Believe me, I did have one.

Check your market and/or sets that you wouldn't think it's in.

Already checked, not in there or the market.

I can actually verify that he had one, not that words count for much.

Not sure enough.

Strangely enough, you sold it to me a short while back (check the bottom of the log).

Ah forgot about that, ty