Joelel - I re-read my original post and realized I didn't specify that I found worker brood in the top brood box, which is why I was so excited. Sorry for the confusion. This hive has been quite the learning experience for me - thanks for your concern and advice!
deknow - I am taking your advice and leaving the drone brood alone to hatch out. I bought a queen excluder yesterday, so I will insert it this weekend and prop the top lid so they can get out. Hopefully, the girls will backfill with some Fall honey!