More than 3,000 volunteers from 30 different states are descending on the Orlando area this weekend for a massive search for missing toddler Caylee Anthony, who is believed to be dead.

The effort will be led by the Texas-based Equusearch and will target about 130 different areas, according to MyFOXOrlando.com.

"This is the largest search we have ever conducted. It is very exciting," said Equusearch executive Gary Peterson.

The 3-year-old's mother Casey Anthony is behind bars for allegedly murdering her little girl, who vanished in mid-June but wasn't reported missing until a month later.

On Friday, attorneys requested a gag order in an effort to stop the steady stream of information and evidence that's been released in the case.

Meanwhile, documents publicized Thursday reveal that Caylee's grandfather worried about the smell of a dead person he detected coming from his daughter's car trunk.

“I had bad vibes the very first day when I got that car," the little girl's grandfather George Anthony said in interviews with investigators on July 24.

He told police that he said to himself, "Please, God, don't let that be my Caylee."

The Florida State Attorney's Office in Orlando released 500 pages of documents, including interviews with the 22-year-old Casey Anthony's parents, her former boyfriend and friends in connection with Caylee's disappearance.

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George Anthony told police that he was concerned about a familiar odor wafting from the trunk of his daughter's Pontiac Sunfire.

As a former homicide investigator, he said, he recognized the smell of death, and his wife Cindy Anthony noticed it too, even though she told the media she thought it was decaying pizza.

"After we pulled inside the garage ... her exact words were, ‘Jesus Christ what died?’" George Anthony said in interviews with authorities. "I’m sitting here as ... a guy who smelled the smell before years ago, and you just never forget it."

Forensic tests released last month confirmed that hair found in the trunk of the vehicle came from a decomposing body. DNA evidence suggests a corpse had been in the car's trunk.

Other documents released Thursday include transcripts from taped interviews with Amy Huzienga, Casey Anthony's former best friend who is now accusing Anthony of forging her checks, MyFOXOrlando.com reported.

On Wednesday, a judge agreed to delay Casey Anthony's check fraud case until after her first-degree murder trial in January. The charges of writing checks using Huzienga's checkbook are unrelated.

Caylee disappeared in June, two months shy of her third birthday, but wasn't reported missing until July.

Anthony said she left Caylee with a baby sitter, but police contend that's a lie.

The little girl has not been found, and authorities say she was killed. In addition to first-degree murder, her mother is charged with manslaughter and other offenses. Anthony has pleaded not guilty.

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Click here for Casey Anthony's indictment.

Click here for a timeline of the Casey Anthony case.

Click here for other documents released.