what may be the possible problem with my Q50 infinity cannot start.

What is your question?

I bought a car from Copart that was said to have an undercarriage damage, "has keys, run and drive". When I received the car there seems to be no undercarriage damage but instead water damaged, keys does not work, and plenty of water on the floor and the trunk. I since dried most of the water. I got a key smith to reprogram the key since it is saying that "key is not detected". We changed the battery on the key fob, the doors will open but it still would not detect the key, even when pressing on the starter knob. I am stuck because Copart would not even reply to my plight after spending $10,300.00. What should I do?

What makes this problem better or worse?

When the batter runs dead

How long has your 2015 INFINITI Q50 had this problem?

since I bought the car about 3 weeks ago