I'm interested, only if the groupon gift cards are physical cards and you have a receipt.
Plus, your story here is not very believable. Your cousin didn't check in advance to see if you could even USE the gift card, before sending you $250 worth???
My cousin in America send to me as a birthday gift, but I can not use it at my country.my giftcard is not from stolen creditcard ,trust me 100% ..sold to you 1 BTC.if you afraid,you can buy it for one by one,there is 10 pcs with $25 balance each giftcard. 
Plus, your story here is not very believable. Your cousin didn't check in advance to see if you could even USE the gift card, before sending you $250 worth???