Yes, there is a way of knowing, but you aren't going to like the result. There are NO Jungle Green, automatic, no sunroof SS's available new. There are only 2 Perfect Blue, automatic, no sunroof SS's left. Also not good news for you. One is in Okeechobee, FL and one is in Clarkston, MI and may be a demo.
Joe Morgan, G8 GXP Registry Organizer, G.O.N.E. Organizer 2010-2013
2009.5 G8 GXP WH 6M onyx/red no roof 12.921 @ 108.89 BONE STOCK! (then), 12.344 @ 110.92 with 1.688 60' at 766' DA, PB with new cam & tune - 12.191 @ 112.35 with 1.693 60' at 1319', 2:59 lap time at Road America on RS-As, 143.1298 mph NoFlyZoneMidwest 2017 1/2 mile into 20 mph headwind. RACECAR NOW RETIRED. All of these are final PBs.
VCM OTR CAI, HSRK, Heater Hose Relocate, custom street/dyno tune by oldskoolgp, Comp Cams 224/228 .581"/.588" 112 LSA cam, LS7 lifters, PAC 1219x springs, Monster LT1S (C7 Corvette) Clutch kit, Katech C6 Hvy Dty Master & Slave Cylinders, Camaro 1LE Diff with 3.91 gears, Kooks LTHs, Solo Hi-Flo Cats & Connector Pipes, Solo Mach Balanced Catback, BMR Toe Rods, Trailing Arms, Cradle & Diff Poly Bushings, 2017 Chevy SS front & rear Brembo calipers and rotors.
1 of only 10 built in this combo (1 of 4 this combo with RS-As)& #1497 built of the 1829