When you redeem for gift card and company sends you extra gift cards by mistake

When you redeem for gift card and company sends you extra gift cards by mistake, i redeemed a gift card and the company sent me extra by mistake or system glitch can they require me to pay them back?

submitted by /u/lesliehuang
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source https://www.reddit.com/r/beermoney/comments/r03klq/when_you_redeem_for_gift_card_and_company_sends/