"This is a very expensive car," said Jim Haddad, owner of the dealership, Hybrid Motors. "Someone walks and gets it in 12 seconds. I can't take it out 12 seconds. He must have come in here before and planned this."
Haddad said just a week before the car was boosted, surveillance video captured the men scoping out the car lot.
The two spent 10 minutes measuring the chain across the entrance and at one point even opening and starting the car.
"It seems like they got scared and they left," Haddad said. "They decided not to take the car that night."
Haddad said he believes the same pair came back a second time on Sept. 8 with hoods to cover their faces for the $40,000 custom sports car.
Haddad said he purchased the Corvette with only one set of keys. The car also has a sophisticated alarm system.
It remains a mystery how the thieves managed to get their hands on a duplicate key.
"According to GM, you can program the key for this vehicle, but you need the position of the car," Haddad said. Upland police are investigating the theft and have distributed fliers of the suspects.
In the meantime, Haddad has added more cameras and now blocks the entrances to his business with cars before locking up.
He is also offering a $2,000 cash reward or a car off his lot worth up to $5,000 for information leading to the car thieves.