The couple's green 2007 Toyota Highlander was pulled out of the Uvas Reservoir this morning about two miles west of San Martin by Santa Clara County Sheriff's deputies, police spokesman Sgt. Jason Dwyer said.
Last night, the California Highway Patrol found the couple's tan 1997 Toyota Camry abandoned near U.S. Highway 101 and state Highway 152 in the Gilroy area, Dwyer said.
"I'm not sure how our having the vehicles will play for us as far as evidence," Dwyer said.
The home invasion robbery happened at about 6:50 p.m. Monday in the 6700 block of Bret Harte Drive in the city's Almaden Valley neighborhood.
One of the victims answered a knock at the front door "and one of the suspects forced their way in," Dwyer said.
Eventually several male suspects got inside the home, brandished weapons and tied up the residents, a 76-year-old woman and a 73-year-old man, according to police.
The robbers then stole property from the home and fled in the victims' cars, which were parked in the garage, police said.
Police have not located any of the suspects, Dwyer said.
"There are many troubling aspects to the home invasion, especially the age of the victims," Dwyer said.
The home invasion case is a priority for police because the suspects were armed, forced their way into the home and threatened the victims with firearms, Dwyer said.