So my friend gave me his Itrip for 20 bux, but it was broken (he didnt know). Then he said to keep the Itrip and gave me my money back. I then called Griffin and they sent me a free iTrip WITHOUT PROOF OF PURCHASE. So should I give my friend 20 bux, should I give him nothing but his broken iTrip, or should I compensate him but not 100%?