[mothered]

there are also, as of now, a couple warehouse items, "in the original box, box will be damaged", if I were to get one of those would I be able to claim there was a wrong / different item in the box and return an old GPU inside it?

If you're referring to Amazon Warehouse Deals, Amazon are pretty meticulous with these types of claims.

All goods are checked using a 20-point quality Inspection prior to dispatch. As such, they'll Immediately Identify It's not their Item, and request the correct one be returned.