Bunnylady
Herd Master
A lot of Steels really just look like a very dark Chestnut; some even have white bellies. Since Steel can look like a self-patterned rabbit, and doesn't show on self-patterned rabbits, it's possible for a Black (or Broken Black) to be carrying Steel, and not show it - so it's possible this could have come from your doe, as well.