It didn’t take much to know who sent the car keys, it was Viola, who should have died after her suicide.
She didn't wait too long, she quickly gave the car keys directly to Wayne to extract fingerprints from the steering wheel of the car in the garage.
The process went smoothly, the fingerprints extracted were Sylvia's and Viola's, at least these fingerprints would show that Sylvia had come across the car.
Wayne even found a car cleaning list in the car, the date on it showed that it was cleaned the day before the crime.
This fingerprint identification report just shows that Sylvia had in this period of time came across the car.
She went back to the surrounding area of the Luster Red Creek Wolf Pack to observe whether there was any surveillance, and pulled out the back door surveillance to find out the image of the car coming in. the person sitting in the driver's seat in the surveillance was obviously Sylvia.