If condition is truly very good, I would say the gun is worth about $2200. Were it excellent, it would go $2700. If barrels were longer, add another $200. Short barrels are a tougher sell these days.
I sold a 20 gauge 470 (which brings a bit more than a 471), 28" barrels, excellent condition for $2800 a couple years ago. And it wasn't on the marketveey long at that.