Although B’dieved we can rely on Pogum after 24 hours, we don’t rely on it Lekatchila. So if you know for sure that an item is refurbished, or the box and packaging looks like it was previously opened and resealed, and especially if you see food specs and other obvious signs that the item was used and returned, you should not buy it and return it if you already did.
Just my opinion, which everyone is entitled to. I am not a kashrus rabbi.