[guyht]

What happens when they want to return the item? Pretty sure you have to offer a 30 day return policy, I could take the 'free' litecoin, then return the USB stick and ask for a refund.

[asperous]

I've sold on ebay, you have a choice whether to offer refunds,

also how long after the sale to offer a refund, and whether you want the buyer or the seller to pay return shipping.