You guys are making a mountain out of a molehill!
Don't worry about the true birth chart for the team. Finding the date is easy enough, but the game time is another matter. And even if you find it there is no guarantee the game started at the time given. These charts are very sensitive to time, so it has to be accurate.
The solution? Simple, you use a chart for the first game of the season, relocated to the home site of the road team. These can be called seasonal birth charts. I have had many years experience with them, and they work very well.
I use them with daily progressions, although other methods of progression work. Only problem with them is that you have to use both pre-natal and post-natal progressions, which makes for more work. But it's necessary as the pre-natal progressions are very energetic in these charts.
As for the Stuporbowl, again, a mountain of a molehill. The game started at 6:32 pm EST. Cast the charts for Atlanta, then relocate first to LA and then to Foxboro. The resulting charts are an absolute no-brainer: the Rams will loose.
I posted a bit more about this on the other forum.
Bulletbob