I check all mine about once a month. I'm a gear head, so I like looking at engines, so, I open hoods quite frequently. I got 5 vehicles. I'm always doing something or another with them. Having a 3 car garage helps.
Was it "floaty" before the repairs? Did the alignment fix it? As stated, who knows what happened before you bought it. You got all new parts covered under warranty. Do you have proof the prior owners were "an elderly couple"? Dealerships will tell you anything. Anyway, you should be good to go now.
Welcome to the forum. My guess would be even if all the necessary hardware and wiring are there to install, he dealer would still need to program the system to operate.