ORANGE COUNTY, Fla. -- The web of misinformation and contradictory statements in the case of missing 2-year-old Caylee Anthony has centered on the child's grandmother after the release of 911 tapes.

Investigators released two 911 calls Thursday that were made by the grandmother of missing toddler Caylee Anthony. She sounds frantic in the calls that were made the night of July 15.

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LISTEN TO 911 CALLS: 911 Call #1 | 911 Call #2
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EXPERT ANALYSIS: Crime Expert Analyzes Anthony Case, Evidence

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On the first call, a crying Cynthia Anthony tells the dispatcher, "I have someone here that needs to be arrested in my home and I have a possibly missing child. I have a 3-year-old that's been missing for a month."

"Have you reported that?" the dispatcher asks Cynthia.

"I'm trying to do that now, ma'am," Cynthia replies.

"What did the person do that you need arrested?" the dispatcher asks.

"My daughter," Cynthia replies. "For stealing an auto and stealing some money."

On the second call Cynthia says, "I found out my granddaughter has been taken, she has been missing. My daughter finally admitted that she's been missing. ... My daughter finally admitted that the babysitter stole her. I need to find her."

"There's something wrong," Cynthia continues to tell the dispatcher in the second call. "I found my daughter's car today and it smells like there's been a dead body in the damn car."

The latter comments contradict what she told Eyewitness News after Casey Anthony's bond hearing on Tuesday.

"There was a bag of pizza for 12 days in a car full of maggots," Casey's mother Cynthia Anthony told reporters.

But after the calls were released early Thursday evening, Cynthia Anthony insisted to WFTV that she did not contradict herself.

"It smelled like something had died in the car. I smelled it. I thought something had died in the car. I didn't know what it was. It could have been a squirrel. It could have been anything. But when we opened the trunk and we saw the maggots in the trunk with all the pizza and stuff, it was a rancid smell," she said.

Casey Anthony, the mother of the missing girl, also spoke on one of the 911 calls and sounded much more calm than her mother.

"My daughter has been missing for the last 31 days. I know who has her. I tried to contact her. I did get to speak to my daughter for about a minute," Casey Anthony tells the dispatcher.

SOURCE CLAIMS NEW CONCRETE SLAB IN YARD

And there is more mystery surrounding the backyard of the house owned by Caylee's grandparents. Deputies already dug up part of the yard after a dog sniffed the distinct smell of a dead body. Now, an inside source told Eyewitness News there may be a new concrete slab or pavers put in the yard since Caylee's disappearance.

The backyard, with the child's playhouse, has been a favorite spot for 2-year-old Caylee Anthony to hang out. Now a source close to the case told Eyewitness News a concrete slab was poured in the yard over the July 4th weekend and the grandmother of the missing girl refused to confirm or deny it.

"I have not talked to anybody about anything and I'm not making any comment about anything. We do yard work around our house all the time and our yard has completely been looked at," said Cynthia Anthony, Caylee's grandmother.

The sheriff's office couldn't confirm a new concrete slab in the yard, but do say there may have been newly installed concrete pavers there.

"The sheriff's office knows everything that we've done in that yard over the last year. We've disclosed everything. If they had any concerns, I would think they would have followed up on it already," Cynthia said.

The Independence Day weekend came just days before the family reported the missing girl to authorities. The Anthony's neighbors wouldn't talk to Eyewitness News, but backyard work might be tough for them to watch anyway; the entire backyard is surrounded by a fence that's tall enough to make it difficult to see over for the normal passer-by.

Eyewitness News' source says special cadaver dogs would have to be brought in to sniff any concrete. Last Friday, investigators spent hours searching the same backyard.

"[If] they want to come back, we told them they could take our whole house down. They could level it. They could dig a big hole, I don't care. Caylee's not there," Cynthia said.

Eyewitness News called the Orange County Buildings Department and they said no construction permits had been issued for the Anthony's home since 2005.