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Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningRear Compartment Lid Emblem/Nameplate Replacement (LT or LTZ)
Rear Compartment Lid Emblem Assembly
Caution: Refer to Exterior Trim Emblem Removal Caution in the
Preface section.
Procedure
The part and surface should be 21°C (70°F) prior to installation. The
vehicle should remain 21°C (70°F) for
one hour after assembly to allow adhesive to deve ...
Installation Procedure
Cut the front end upper tie bar in corresponding locations to fit the
remaining original panel. The sectioning joint should be trimmed
to allow a gap of one-and-one-half-times the metal thickness at the
sectioning joint.
Create a 50 mm (2 in) backing plate from the unused portion of ...
Remote Keyless Entry (RKE) System
The Remote Keyless Entry (RKE) transmitter may work up to 60m (195 ft) away from
the vehicle.
RKE Transmitter with Remote Start Shown
Press the key release button to extend the key blade. The key can be used for
the ignition and all locks.
Press to unlock the driver door
or all doors.
P ...