scored a major find last week when I picked this three car Ives hand-painted consist. Dave Bashline, over on the Other Tinplate Facebook page agrees they look original from 1901 or 1902, although I believe the wheels on the coach and baggage cars should also be the red cast iron wheels as seen on the tender. Seller offered the loco on a separate auction that quickly went well beyond my price range. Have also seen these same cars in red rather than green.
here is one possible boxed set they might have come from.