To confirm that mtgox owns the account you can see my history:
04/28/11 13:20   Add BTC   16Fh8FhzDESJpwYd9oDRj9bHMuZUpu2111   9.97   0   9.97   83.909

At http://upmyphoto.com/image/64656/6865778

http://upmyphoto.com/images/FreeUploadUser/mtgoxhistory.jpg