This is the information that Sapphire have on their website regarding the BF4 Promo.
"Special BF4 Editions have a sticker on the box and a voucher in the box. We are working with the stores and websites that sell our products to further identify which SAPPHIRE R9 series graphics cards are eligible for the voucher, however, please verify if your SAPPHIRE graphics card includes the bundle BEFORE you purchase."
It looks like products that include this offer should have a sticker on the box indicating the same.
AMD Customer Care
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