I had this happen to me last season, 4th down, offense fumbles, players from both sides scramble for the ball, pileup is a good 5 yards short of the line to gain. Since I knew it'd be a turnover no matter what, I didn't really bother to dig, just yelled "It's a turnover" and once the players un-piled, turned the ball over to the defense. We conveniently ruled the defense recovered the fumble, but I suppose it really didn't matter.
How would you guys handle such a situation?