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What is a Keystone Card Proxy Number?

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I just submitted a Corsair rebate for my recently purchased Corsair HXi HX1000i power supply bought on newegg. After filling out Corsair's online rebate submission page, the mail-in form states that I must "attach the following required proof of purchase":


-Keystone Card Proxy Number

-Original UPC

-Store Receipt


Can anyone answer what is the Keystone Card Proxy Number?

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