Searchers have found a missing Atlanta couple's vehicle four miles from their Hilton Head Island, S.C., yacht home, but the couple remain missing, authorities told The Atlanta Journal-Constitution at 1 p.m. Friday.

Beaufort County Sheriff's deputies found John and Elizabeth Calvert's 2006 Mercedes at Palmetto Dunes, a gated community on Hilton Head, about 3 a.m., said Lt. Col. Neil Baxley.

Family photo (ENLARGE)

Elizabeth Calvert

Family photo (ENLARGE)

John Calvert

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Baxley said the South Carolina Law Enforcement Division is going over the vehicle "with a fine-tooth comb."

Baxley said there was no evidence of a crime, but, "We are not ruling anything out. We are investigating every possible scenario."

Earlier Friday, investigators canceled a planned morning search of the couple's yacht because of bad weather, Baxley said.

The couple lives part-time at a home on East Brookhaven Drive in DeKalb County. They disappeared Monday night after a business meeting on Hilton Head Island, S.C., where they live on their yacht, the Yellow Jacket, investigators said.

David White of Decatur, Elizabeth Calvert's brother, reported the part-time Atlanta couple missing Tuesday when his sister did not show up for a meeting at her Savannah law office.

In a statement released Thursday, Sally Nielsen, an attorney who works with Elizabeth Calvert at Savannah's Hunter Maclean law firm, said: "This is so unlike Liz and John to be out of touch with business colleagues and friends.

"We are most concerned for their safety."

Investigators with the Beaufort County Sheriff's Office used evidence-sniffing dogs Thursday to search the couple's yacht and surrounding waters, but found no evidence to suggest their whereabouts, Baxley said Thursday.

Baxley would not comment on the search, other than to say it was ongoing. He said the investigation was not criminal in nature.

"At this point, it's still a missing persons case," he said.

The couple owns Harbour Town Yacht Basin and Harbour Town Resorts on the island.

They have no children. Their dog Sadie is in an Atlanta kennel, said Tony Gibus, who runs the couple's marinas. Their cat, which lives on the boat, is being cared for by friends, he said.

"It's just not characteristic for these people to be missing for any period of time," said Gibus, who has known the couple for years and operates their marinas. "We're very concerned. We need these people back."

Baxley said authorities have accounted for the couple's private plane.

Meanwhile, Beaufort County Sheriff P.J. Tanner told the (Hilton Head) Island Packet: "This is suspicious because no one has had any contact with them in the past couple of days, which is unlike the Calverts because they're active in the community. Right now, the only thing we can say is there are definitely suspicions here."

Baxley said that John Calvert has no known immediate family and that investigators have been in "constant contact" with Elizabeth Calvert's brother. White, however, could not be reached for comment Thursday.

In Atlanta, neighbors in the Calverts' neighborhood in historic Brookhaven described the couple as friendly and fairly low-key.

"He enjoys firing up the grill and having friends over," said Lynn Johnston, 76, who lives next door to the Calverts' one-story white wood-framed house overlooking the Capital City golf and social club. "She is really into the dog. They are very nice, good neighbors."

Prior to working at the Savannah law firm, Elizabeth Calvert was a vice president in the legal department of Atlanta-based UPS, according to her biography posted on Hunter Maclean's Web site.

John Calvert is a member of the Hilton Head Marketing Partnership Alliance, which encourages tourism in the South Carolina low country.

"He is a strong member of the chamber and a supporter of tourism for Hilton Head Island," said Charlie Clark, spokeswoman for the Hilton Head Island-Bluffton Chamber of Commerce.

Nancy Cappelmann, a friend of the couple's and harbor master at Harbour Town Yacht Basin, said the couple's cellphones and BlackBerries have been turned off since 6 p.m. Monday. "They are very committed to the businesses here and are always available by cellphone," said Cappelmann, who urged anyone with information to call the Beaufort County Sheriff's Office at 843-842-4111.

"John and Liz Calvert are not the type of people to walk away from their responsibilities."

The Calverts had no known financial problems, friends have said.

The couple is up to date on their property taxes, according to online records in DeKalb County and Beaufort County, S.C.

Last year, the couple paid $8,000 in property taxes on their four-bedroom, two-bath home overlooking the Capitol City social club in northeast Atlanta. At the time, the home on East Brookhaven Drive was valued at $674,900, tax records show.

On Hilton Head Island, the couple paid $1,400 in taxes last year on their Sea Pines boat slips, which were valued at $123,5000, according to Beaufort County tax records.