It's new, 40 miles on it. The dealer said they made it optional for 17. It does have the Sport emblem on the rear.
I'm not saying your dealer is not telling you the truth, just ill informed and an end product Ford's stellar QA/QC process. Taken directly from Ford's website for the 2017 Explorer Sport:
Exterior Features
Appearance
Standard
· Black lower front and rear bumpers, wheellip moldings and bodyside cladding
· Body-color liftgate spoiler
· Exhaust - Fascia-integrated, dual tips
· Fog Lamps
· Grille, High gloss black with high gloss black bars
· Hands Free Power Liftgate
· Headlamps – Autolamp Auto On/Off, LED Low Beams, Halogen Reflector High Beams
· LED Signature Lighting
· LED taillamps with unique blackout treatment on Sport
· Automatic LED Low-Beam Headlamps
· Liftgate Appliqué - high gloss black
· Mirrors - Gloss Black finish, Heated with LED signal indicators and approach lamps
· Painted black exterior door handles
· Roof rack side rails - High Gloss Black
·
Unique EXPLORER badge on hood
· Roof rack side rails, gloss black
Optional
· Mirrors - Gloss black, PowerFold with Auto-Fold, drivers memory
· Ruby Red Metallic Tinted Clearcoat
· White Platinum Metallic Tri-coat Paint
· Canyon Ridge
· Shadow Black
· Magnetic
· Smoked Quartz
· Ingot Silver
It may be worthwhile showing your dealer the website.