ORANGE COUNTY, Fla. -- George and Cindy Anthony were back at the sheriff's office meeting with investigators Monday morning, a day after their daughter refused their scheduled visitation.

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PARENTS AT SHERIFF'S OFFICE: George & Cindy Arrive | See Images | Sgt. Allen Explains
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Meanwhile, investigators said they received a tip of a suspicious smell in a wooded area near a gas station around three miles from the Anthony home. Investigators were briefly on the scene Monday afternoon off Lee Vista Boulevard, just west of Narcoossee (see map). An investigator on the scene told Eyewitness News the tip was related to the search for missing 3-year-old Caylee Anthony, but said they found nothing of interest in the case.

Monday marked 27 days since now 3-year-old Caylee Anthony was reported missing. The missing girl's grandparents said Monday's meeting with investigators was scheduled last week and was an opportunity for them to ask investigators questions about the search for Caylee.

"Just to get some information from the search department to see how the search is going for our granddaughter," George Anthony told Eyewitness News as he and Cindy walked into the sheriff's office Monday morning. "It's just a question and answer period for both of us. We have some questions for them. This is going to be an ongoing thing we do with them until our granddaughter comes home."

When they are done, George Anthony told Eyewitness News he's hitting the highway with a mobile billboard in tow. He readied his car Monday to pull a trailer with his missing granddaughter's picture on it and a number to call with information. George said he'll drive the mobile billboard along SR-50, the 408 and the 417.

CASEY REFUSES VISITATION WITH PARENTS

On Sunday, Casey Anthony refused a schedule visitation with her parents. Channel 9 asked Cindy Anthony on Sunday if she thinks Casey cancelled because she did not want to defend statements from a search warrant that claim she never received or made a cell phone call to Caylee's mystery babysitter Zenaida Gonzalez. She is the woman Casey claimed last had her daughter.

"I've got the phone records so I'm not so sure, I'm not sure what you guys are talking about. I've not seen anything from the Sheriff's Department and they have not confirmed anything to that. I would like to see her, but what am I going to say. What am I suppose to say? That's her perogative," Cindy said Sunday.

According to sources, Casey has been watching some news coverage, which may have included when the Anthonys spoke out against her.

"She's going to have to pay for some of the stuff she's put herself and put her daughter through," George Anthony said last week.

On Friday, Casey also turned away her brother Lee.

Regardless of Casey's motive, her parents were disappointed that their daughter chose to snub family members for the second time.

"You always want to see your child, but then again, she had her reasons," Cindy said.

Cindy told Channel 9 that she believes Casey's reason may be petty.

"Maybe it's based on me cancelling my appointment with her the other day," she said.

Two visitations remain scheduled for this week. Tuesday morning, Casey's brother Lee is scheduled to visit. George and Cindy Anthony will make another attempt to visit their daughter Thursday morning.

There was no explanation given as to why Casey Anthony declined the visit Sunday.

GRANDPARENTS CELEBRATE CAYLEE'S BIRTHDAY

Cindy and George Anthony did not speak much to the media Saturday, Caylee's third birthday. George only came out to thank some friends and well-wishers who had dropped off balloons, flowers and cards in front of the family home.

"I appreciate these more than you can ever imagine," he said. "This is the kind of news that should be out there, not this other stuff that's going on."

The Anthonys said they bought Caylee presents and made her favorite dinner, chili.

"We usually have a huge buffet, people stay all night, we have music," Cindy Anthony said Friday. "It gets harder and harder not to see her, not to get those little hugs and little smiles."

Caylee's mother, Casey Anthony, remains in the Orange County jail. She's charged with child neglect and lying to authorities regarding the disappearance of her daughter.