My G37 Car Experience Today

So my driver side window in my car as been acting weirdly. Basically it has not been working in the afternoons and nights. I am guess from the heat. Its a big pain when you have to go in and out of a garage where you need to roll down your window to use your keyfob. I took my car in this morning to Plaza Lexus in St Louis. They gave me a loaner car like they always do. I walked out of the service bay with the service writer looking for the loaner car. The porter said it was one of the three cars in front of the building. We couldn’t find it so asked the porter. He said it was the one we were in front of even though my key said 3 and this one was 13. It started right up with the keyless ignition fob in my hand so I didn’t think anything. The gas also matched what my paperwork said which was between 1/2 and a 1/4 so I assumed this was it.  I drove away and hopped on I-270. I noticed that I had a bunch of alerts. The first two being oil change and filter needed. Thought this was pretty weird being its a dealers car. The third one said “no key.” I immediately moved the key closer but assumed that the diagnostic screen was messed up since I was now 5 miles away from the dealer and the car started. I got to my office after a 30 minute drive then tried to lock the car with the key fob. It wouldn’t lock. I then tried to start it and it did not. Looks like I did have the wrong car. So how did the thing start the first time. Either the porter had the key in his pocket or even scarier possibility is that the car was close enough to the office that it picked up the key fob. We were probably 15 or 20 ft away so not sure the range. What is scary about that is what if that was your unlocked car in your driveway. A kid or a thief could go start your car while you were watching TV in the house. Why did the car not shut down once out range of the car? Pretty odd.