As the above folks have mentioned, a picture would help immeasurably. Short of that, if you truly believe it is a 7 figure coin, and wish to have it graded/verified as genuine, I suggest getting on a plane with it and flying to Florida to hand deliver it to NGC for grading.
However, as @Coinbuf said, we have seen numerous "life altering" coins on this board and others, and only once have I seen one actually be the real deal. And that was "only" a $20k coin. But of course, in that instance, many members of those boards agreed that the coin looked genuine and was worth the expense of having it graded/verified.