Selling items to CEX for credit vouchers.
I am thinking about selling a few unopened (still in cellophane) PS4 games to CEX in exchange for vouchers which I would like to use towards a console. Will I have to unwrap all of the games before they buy them - I'm just worried that if I do that, and they don't want the games, I won't be able to get a refund from the shop that I bought them from. Also, with the vouchers, I read on an old post (3 years old) that if you want to buy an item in the store using your vouchers, you will have to pay the cash and then send the vouchers off to their Head Office to get the cash refunded - is this actually correct, as I was hoping to use the vouchers in the store to purchase something else? Also, are you allowed to make up the difference in price with cash, or do you have to have the complete amount of vouchers only to pay for the item that you want to buy? Thank you.