If you’re a Best Buy Rewards member, check your inbox for a possible free $5 Reward! The e-mail has a subject line of “Reveal your Mystery Reward now. It could be worth up to $5,000 in My Best Buy reward certificates” and comes from from BestBuyInfo@emailinfo.bestbuy.com. Once you open the e-mail, click the reveal button to reveal your reward, which will be valid for a limited time only.