ORANGE COUNTY, Fla. -- 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.

---

TEAM COVERAGE: Friends Reveal New Details As Mom Remains Jailed
CASEY'S FRIENDS: New Details Revealed To Channel 9 By Casey's Friends
BIG REWARD: $225,000 Offered For Info Leading To Safe Return
EXPERT ANALYSIS: Crime Expert Analyzes Anthony Case, Evidence
READ BOND ORDER: Official Document For Casey Anthony Bond (PDF)

---

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.

Attorney Makes Accusations Against Sheriff's Office

Fireworks were flying Wednesday night in the case of missing 2-year-old Caylee Anthony. Her mother's attorney, Jose Baez, made startling accusations against the Orange County Sheriff's Office while appearing on CNN's Nancy Grace show.

Baez said his client, Casey Anthony, is keeping her head up, but was bothered by the high bond that her family has to come up with to get her out of jail, where she has been held for a full week. Detectives, though, say Casey and her attorney are slowing their investigation, something her attorney denies.

"The confusion comes from everyone's misunderstanding about attorney-client privilege and about what I'm willing to do," said Baez.

In fact, he accused Orange County Deputy Carlos Padilla of lying about their communication.

"So Padilla is completely lying when he says you have not returned his phone calls?" Baez was asked.

"100%, 100%," he said.

In his strongest words yet about investigators searching for Caylee, Baez said he simply wouldn't allow a free-form grilling of his client by detectives. The statement was made after his TV appearance Wednesday night, during which host Nancy Grace said investigators had called in and tried to set up a meeting with Baez.

"I will be the go-between and I will help them in anything they need. If they want to sit there and interrogate her, that's just not going to happen," said Baez.

The Orange County Sheriff's Office has repeatedly said Casey Anthony holds the key to the case and she has not been as cooperative as they would like. They said Baez's comments on TV were ridiculous.