Basically everything that was stated above, but I would include not to turn on the device until the full refund is issued. I don't think there is anything in particular you need to be worried about regarding resale.
I used to sell it on an application called OfferUp. Met up in person. I actually got charge backed the 2 times I sold on eBay and it was a bitch to get the money back lol. The scammer becomes the scammed :P
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