ORLANDO , Florida ( CNN ) -- The meter reader who led authorities last week to remains believed to be those of Caylee Anthony called police four months ago , directing them three times to same site , authorities said Thursday . Caylee Anthony , 2 , has been missing since June in a case that has received national attention . At a news conference , Capt . Angelo Nieves , an Orange County Sheriff 's Department commander , said investigators are looking into whether the tips , called in August 11 , 12 and 13 , were properly followed up . In one of those phone calls , the meter reader reported seeing a gray bag on the side of the road , Nieves said . On August 13 , a deputy responded to the site and did a `` cursory search '' but found nothing , Nieves said . Casey Anthony , 22 , faces charges including first-degree murder in the June disappearance of her daughter , Caylee , who was 2 at the time . Remains described as being those of a small child were found last week a half-mile from Casey Anthony 's parents ' home , in the area where the meter reader first directed police . Nieves said police were getting more information from the tipster and the deputy who responded to the tips . He said the department was investigating the `` thoroughness '' of the deputy 's response but would not identify the deputy . The meter reader `` is not a suspect , '' Nieves said . `` He is a credible witness . '' Nieves ' latest announcement is raising questions about whether police missed several chances to find remains believed to be Caylee 's . The meter reader is not the only one , or the first , to have pointed police toward the site containing the remains . KioMarie Cruz , Casey Anthony 's childhood friend , also told police to investigate the same wooded area near Hidden Oaks Elementary School a month before the meter reader , according to CNN affiliate WFTV . In an interview with detectives , according to WFTV , Cruz said that she and Anthony `` pretty much used to hang out there most of our time , '' would `` snack on food for hours '' and went there to `` get away from our parents . '' The sheriff 's office followed up on that tip , but the wooded area was covered in floodwaters , preventing a search . Nieves said the water may have been present at the time of the meter reader 's tips as well . Nieves also said Thursday that searchers combing the site after the skull 's discovery had found `` significant skeletal remains '' consistent with those of a small child on the outer perimeter of the search area . The area will be enlarged , and processing and searching of the site will continue , probably into the weekend , he said . Some of the remains have been sent to the FBI lab in Quantico , Virginia , in an effort to identify them . Authorities have said the remains are believed to be Caylee 's , but an identification is pending . Sheriff 's spokesman Carlos Padilla said last week that authorities believe the remains are Caylee 's for three reasons : No other children have been reported missing in the area ; the remains are consistent with those of a child of Caylee 's age ; and the remains were found near the home of the grandparents , where the 2-year-old and her mother were living just before Caylee disappeared . FBI spokesman Richard Kolko said Monday that he did not know when tests would be complete , but an attorney for Anthony 's parents said the FBI is likely to have results `` within the next week . '' Casey Anthony could face a sentence of life in prison if convicted . Prosecutors said this month that they would not seek the death penalty .
Officials say worker who found child 's remains called in three tips in August . Authorities looking into whether earlier tips were mishandled . Casey Anthony 's friend told police to check the area five months ago , WFTV reports . Sheriff 's Department says new skeletal remains found in search area .