For the previous 28K+ games, the tickets sold at about 500-1000 a day in the days running up to it, and about 500 on the day, with most (as you would expect, selling in the late evening (I monitored the seats being sold - sad old git that I am).
That would suggest they would sell 2K-3K more in these coming days, and they only have 2k left to sell. Plus, they have reduced the capacity since that Tigers game, with the new screen taking up more seat spaces than the older, smaller one did.