Replying to Purchased a certified used car....major issue noticed 2 weeks after driving

So I bought a certified pre owned nissan xterra. Dealership absolutely sucked and it was a miserable experience but it was a good deal and I wanted the car.

I noticed about a week and a half - 2 weeks after I was not provided with a spare tire / jack even though on the certified checklist it said that they reviewed it and it was safe/tire pressure/tread life was fine.

I am in the process of dealing with the dealership but is there anything I can do? Or since I drove off the lot without noticing it is this my fault?

Im prepared to take this above the dealership's GM to the regional manager and so on if this is the case. The dealer already has 23 Better beurou (spelling) of business complaints against it since 2013 so obviously its a sketchy place.