What is an reportable offense?

Okay, so this is a little strange and wanted to know if I am able to report a player who griefed me.
How did they do this you may ask?
Well, I won an item "The shoveler" in a dungeon. After the dungeon I went to trade to try and sell it of course. Someone responds and says he wants to buy the item and to send it to him right away by C.O.D and to hurry.
I was like alright, but this guy never said a price and i thought this was strange. So i ask the guy is 30g C.O.D alright?
He says, yes, please send it right away. I'm like well... alright, not sure what he was in a rush for.
Anyway, 24 hours later and no mail returned yet. I'm figuring this guy tried to have me send him gold or something. I have no idea what his motive is for wanting to do this.
What are your thoughts on this?
I believe I have to wait a week for the C.O.D to timeout and have the item returned to me?
Is this even reportable?
How did they do this you may ask?
Well, I won an item "The shoveler" in a dungeon. After the dungeon I went to trade to try and sell it of course. Someone responds and says he wants to buy the item and to send it to him right away by C.O.D and to hurry.
I was like alright, but this guy never said a price and i thought this was strange. So i ask the guy is 30g C.O.D alright?
He says, yes, please send it right away. I'm like well... alright, not sure what he was in a rush for.
Anyway, 24 hours later and no mail returned yet. I'm figuring this guy tried to have me send him gold or something. I have no idea what his motive is for wanting to do this.
What are your thoughts on this?
I believe I have to wait a week for the C.O.D to timeout and have the item returned to me?
Is this even reportable?