Kronk called in a tip on Aug. 11 but only told police the general area where he saw a gray and black bag and did not meet the responding detective, Padilla explained. The detective did not find anything suspicious and cleared the area. The man called again on Aug. 12 and Aug. 13, at which point police returned to the scene but again did not find anything to raise their suspicions.
"It's just baffling that the sheriff's department wouldn't have found a body if it was there in August," Brad Conway, the attorney for Caylee's grandparents George and Cindy, told "Good Morning America." "[Caylee's] grandparents are obviously disturbed by the new finding and results from the sheriff's department. All along they wanted each and every tip followed up closely to avoid this scenario."
Padilla told ABC News that police are investigating the "thoroughness" of the response, but said the area had a significant amount of water flooding many parts.
"We're trying to make sure -- is it possible that we missed an opportunity to locate these remains back in August?" Padilla said.
Caylee Anthony disappeared in June but was not reported missing by her mother, Casey, until a month later.
After a search warrant was executed on the Anthony home, police were seen taking boxes and bags of evidence out of the house. On Tuesday, Padilla told ABC News that "evidence is mounting."
Jose Baez, Casey Anthony's defense attorney, motioned twice to gain access to evidence in and from the crime scene and was twice rebuffed by Judge Stan Strickland.
"The grid area has been expanded... We have a situation in which we have been accused of possibly delaying our release of the location," Nieves said Thursday. "Obviously that has been proven incorrect by the thoroughness of investigators today. They continue to work, process and scour the location as thoroughly as possible."
The case began with an emergency call from Casey Anthony's mother, Cindy Anthony in mid-July.
On the tape, she is heard frantically telling emergency operators, "I can't find my granddaughter. ... There's something wrong. ...I found my daughter's car today and it smelled like there's been a dead body in the damn car." Casey Anthony then got on the phone and reported she may have a missing child.
Cindy Anthony later retracted that statement, saying that the smell in the car could have been from garbage.
As investigators would quickly learn, this would only the be first of many twists and story changes in the curious case.
CLICK HERE for a timeline of the case.
Since their investigation was launched on July 15, some Orange County officers have become well acquainted with the frustrations of following leads based on incomplete information, half-truths and what one officer said were "smoke bombs."
In the original version of events, Caylee's mother reported her missing to police, saying she had dropped the child off at a babysitter's house on June 9. When she went to pick the child up, both the child and the baby sitter had disappeared.
Casey's parents both corroborated the story until a bond hearing on July 25 when Cindy Anthony said that the last time she saw the child was not on June 9, but on June 15, and that she had just been confused.
When police questioned Casey Anthony about her daughter prior to her arrest, they say Anthony misled them multiple times.