ZeroLemon 10,000mah battery/case for a Note 3 – price?

I bought this for my note 3 but it was faulty so I sent it back and got a refund.
Now I have it here, brand new, not opened.
I looked on eBay and the prices are different.
There’s only one in the UK, the rest are from the US.
I paid £42.99.
What can I sell it for??
Answer #1
If you sent it back and got a refund, why do you still have a new one?
Answer #2
If you sent it back and got a refund, why do you still have a new one?
If you read what I said, I sent my Note 3 back and got a refund but still have the ZeroLemon battery/case.
Thought that was obvious.