Origanal box

[bot@xs]

You must return the products to us in their original or equivalent packaging with all original components, prepay shipping charges, and insure the shipment or accept the risk if the product is lost or damaged in shipment.

there are instructions are what counts.
if you read it correctly thou:
"..original or equivalent packaging.." tells you right here that the original packaging is not required.
also, "..all original components.." components not accessories, that means the original attached cooler/ fan, pci bracket, etc, only what was/ is originally attached to the card coming out the box.

you should double check with them to make sure thou. RMA can differ from manufacturer to manufacturer.