I don't believe the VIN decoders (or the steering wheel) will give you a full list of all the options on your vehicle. On my '13, the sticker showing the RPO codes for the vehicle's options is inside the passenger-side hatch cubby (not the glove box), so if you don't find it in the glove box, give that a try. Then, you will find a list of the RPO codes here.
When I took my used Volt in for servicing the first time, I asked them to print me out a build list based on my VIN. They were happy to do it free of charge. It shows each and every option the car was delivered with.
Given the replies on this thread there are a number of places to look. On my 2018 Premier the codes are not printed. Rather there is a sticker with a QR code on the the driver side door frame. I used a smart phone app to scan the QR code. The QR code lists the RPOs along with the VIN. Good luck!
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