ITunes card inspection

You know that you are only talking to fellow users on here, nobody on here can tell you when it was redeemed.

If you redeemed it onto your own account you could try contacting iTunes Support and see if they can/will tell you when you redeemed it. If somebody else redeemed it you will have to ask that person when they did so.

If the card hadn't been activated properly you would get a different message, it would say something along the lines of 'not activated' - you would only get the 'redeemed' message if the card had been activated and successfully redeemed onto an account