Dealer overfilled transmission fluid 2007 civic hybrid

Just had my 2007 Civic Hybrid serviced by Honda Dealer. Manual clearly states 3 quarts trans fluid; yet 4 quarts were added according to invoice. Didn’t realize this until I drove the car 250 miles and saw the fluid leaking on garage floor. Before I call Dealer, how much damage could have been done to my car. It runs fine.